INVESTMENTS IN AND ADVANCES TO AFFILIATES (Details)

v3.26.1

INVESTMENTS IN AND ADVANCES TO AFFILIATES (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2026		Mar. 31, 2026
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		198.20%	[1],[2],[3],[4]	195.90%	[5],[6],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[8]	$ 1,309,248
Ending balance		$ 1,282,020
Percentage threshold of qualified assets representing total assets in order to acquire non-qualified assets		70.00%
Investment, interest rate, paid in cash		3.70%		3.70%
Collateral Pledged
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 1,200,000
Ending balance		1,100,000
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. - Common Stock Warrants
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Units	[11],[12]	3.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance		$ 0
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Common Stock Warrants
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Units		3.50%	[15],[16],[17],[18],[19]	3.50%	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 0
Ending balance	[15],[18],[19]	$ 0
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		7.00%	[1],[2],[3],[4],[15],[18],[24]	7.00%	[5],[6],[7],[9],[23],[25],[26]
Investment, reference rate and spread		2.00%	[1],[2],[3],[4],[15],[18],[24]	2.00%	[5],[6],[7],[9],[23],[25],[26]
Line of credit facility, available		$ 0	[1],[2],[3],[4],[15],[18],[24]	$ 0	[5],[6],[7],[9],[23],[25],[26]
Principal amount		3,080	[11],[12],[15],[16],[18],[24]	$ 3,080	[20],[22],[23],[25],[26]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[25],[26]	3,080
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[15],[18],[24]	$ 3,080
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit 2
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		7.00%	[1],[2],[3],[4],[15],[18],[24]	7.00%	[5],[6],[7],[9],[23],[25],[26]
Investment, reference rate and spread		2.00%	[1],[2],[3],[4],[15],[18],[24]	2.00%	[5],[6],[7],[9],[23],[25],[26]
Line of credit facility, available		$ 0	[1],[2],[3],[4],[15],[18],[24]	$ 0	[5],[6],[7],[9],[23],[25],[26]
Principal amount		1,050	[11],[12],[15],[16],[18],[24]	$ 1,050	[20],[22],[23],[25],[26]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[25],[26]	1,050
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[15],[18],[24]	1,050
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares		14,304	[11],[12]	14,304	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 0
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance		$ 0
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[15],[18],[24]	7.00%
Investment, reference rate and spread	[1],[2],[3],[4],[15],[18],[24]	2.00%
Principal amount	[11],[15],[16],[17],[18],[24]	$ 14,000
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		3,812
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(483)
Ending balance	[15],[18],[24]	3,329
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23],[25],[26]			7.00%
Investment, reference rate and spread	[5],[6],[7],[9],[23],[25],[26]			2.00%
Principal amount	[20],[22],[23],[25],[26]			$ 14,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[25],[26]	$ 3,812
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.– Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[15],[16],[17],[18],[19]	14,304
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[15],[18],[19]	$ 0
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		6,653	[16],[17],[18],[19]	6,653	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 49,815
Ending balance	[18],[19]	$ 52,374
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.70%	[1],[2],[3],[4],[18]	13.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		10.00%	[1],[2],[3],[4],[18]	10.00%	[5],[6],[7],[9],[23]
Principal amount		$ 17,700	[16],[17],[18]	$ 17,700	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	17,700
Ending balance	[18]	$ 17,700
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 2
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.70%	[1],[2],[3],[4],[18]	13.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		10.00%	[1],[2],[3],[4],[18]	10.00%	[5],[6],[7],[9],[23]
Principal amount		$ 6,850	[16],[17],[18]	$ 6,850	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	6,850
Ending balance	[18]	$ 6,850
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc - Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[16],[17],[18],[19]	21,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[18],[19]	$ 26,580
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	14.70%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	11.00%
Principal amount	[16],[17],[18]	$ 38,250
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[18]	38,250
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[20],[21],[22],[23]			21,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	30,737
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			14.70%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			11.00%
Principal amount	[20],[22],[23]			$ 38,250
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 38,250
Investment, Identifier [Axis]: Detroit Defense, Inc. - Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[15],[16],[17],[18],[19]	17,388
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[15],[18],[19]	$ 1,771
Investment, Identifier [Axis]: Detroit Defense, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[20],[21],[22],[23],[27]			17,388
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23],[27]	$ 12,572
Investment, Identifier [Axis]: Detroit Defense, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.00%	[1],[2],[3],[4],[15],[18]	13.00%	[5],[6],[7],[9],[23],[26],[27]
Investment, reference rate and spread		9.00%	[1],[2],[3],[4],[15],[18]	9.00%	[5],[6],[7],[9],[23],[26],[27]
Principal amount		$ 61,305	[15],[16],[17],[18]	$ 61,305	[20],[22],[23],[26],[27]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[26],[27]	61,305
Ending balance	[15],[18]	$ 61,305
Investment, Identifier [Axis]: Diligent Delivery Systems – Common Stock Warrants
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Units		8.00%	[16],[17],[18],[19]	8.00%	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 0
Ending balance	[18],[19]	$ 0
Investment, Identifier [Axis]: Diligent Delivery Systems – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		12.70%	[1],[2],[3],[4],[18],[24]	12.70%	[5],[6],[7],[9],[23],[25]
Investment, reference rate and spread		9.00%	[1],[2],[3],[4],[18],[24]	9.00%	[5],[6],[7],[9],[23],[25]
Principal amount		$ 13,000	[16],[17],[18],[24]	$ 13,000	[20],[22],[23],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[25]	512
Ending balance	[18],[24]	$ 4,279
Investment, Identifier [Axis]: Dreyfus Treasury Obligations Cash Management Fund
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		3.29%	[1],[2],[3],[4],[28]	3.30%	[5],[6],[7],[9],[29]
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[15],[18],[24]	9.20%
Investment, reference rate and spread	[1],[2],[3],[4],[15],[18],[24]	5.50%
Principal amount	[11],[15],[16],[17],[18],[24]	$ 9,210
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		613
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(109)
Ending balance	[15],[18],[24]	$ 504
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. - Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[15],[16],[17],[18],[19]	8,199
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[15],[18],[19]	$ 0
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares		8,199	[11],[12]	8,199	[20],[21],[22],[23],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23],[26]	$ 0
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance		0
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23],[25]			9.20%
Investment, reference rate and spread	[5],[6],[7],[9],[23],[25]			5.50%
Principal amount	[20],[22],[23],[25]			$ 9,210
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[25]	$ 613
Investment, Identifier [Axis]: Educators Resource, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		8,560	[16],[17],[18],[19]	8,560	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 11,630
Ending balance	[18],[19]	$ 11,823
Investment, Identifier [Axis]: Educators Resource, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		14.20%	[1],[2],[3],[4],[18]	14.20%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		10.50%	[1],[2],[3],[4],[18]	10.50%	[5],[6],[7],[9],[23]
Principal amount		$ 30,000	[16],[17],[18]	$ 30,000	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	30,000
Ending balance	[18]	$ 30,000
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Common Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		16,957	[16],[17],[18],[19]	16,957	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 3,447
Ending balance	[18],[19]	$ 12,648
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		7.80%	[1],[2],[3],[4],[18]	7.80%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		4.10%	[1],[2],[3],[4],[18]	4.10%	[5],[6],[7],[9],[23]
Principal amount		$ 6,900	[16],[17],[18]	$ 6,900	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	6,900
Ending balance	[18]	$ 6,900
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 2
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		10.70%	[1],[2],[3],[4],[18]	10.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		7.00%	[1],[2],[3],[4],[18]	7.00%	[5],[6],[7],[9],[23]
Principal amount		$ 18,796	[16],[17],[18]	$ 18,796	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	18,796
Ending balance	[18]	$ 18,796
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Common Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		63,747	[16],[17],[18],[19]	63,747	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 0
Ending balance	[18],[19]	$ 0
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		19,280	[16],[17],[18],[19]	19,280	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 12,258
Ending balance	[18],[19]	$ 13,645
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.70%	[1],[2],[3],[4],[18]	13.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		10.00%	[1],[2],[3],[4],[18]	10.00%	[5],[6],[7],[9],[23]
Principal amount		$ 12,200	[16],[17],[18]	$ 12,200	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	12,200
Ending balance	[18]	12,200
Investment, Identifier [Axis]: Gladstone Alternative Income Fund – Common Equity
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 89
Principal Shares		500,000	[11],[12]	500,000	[20],[21],[22],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[30]	$ 5,005
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(60)
Ending balance		$ 4,945
Investment, Identifier [Axis]: Gladstone Alternative Income Fund. – Common Equity
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[16],[17],[19],[31]	500,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[19],[31]	$ 4,945
Investment, Identifier [Axis]: Global GRAB Technologies, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		21,100	[16],[17],[18],[19]	21,100	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 25,022
Ending balance	[18],[19]	21,134
Investment, Identifier [Axis]: Global GRAB Technologies, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			13.50%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			9.00%
Principal amount	[20],[22],[23]			$ 46,500
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 46,500
Investment, Identifier [Axis]: Global GRAB Technologies, Inc. –Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	13.50%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	9.00%
Principal amount	[16],[17],[18]	$ 46,500
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[18]	$ 46,500
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	13.00%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	9.00%
Principal amount	[16],[17],[18]	$ 3,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[18]	3,000
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[20],[21],[22],[23]			3,275
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	0
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			13.00%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			9.00%
Principal amount	[20],[22],[23]			$ 12,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 8,379
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc.- Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares	[16],[17],[18],[19]	3,275
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[18],[19]	$ 311
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		10,080	[16],[17],[18],[19]	10,080	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 0
Ending balance	[18],[19]	$ 0
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		6.00%	[1],[2],[3],[4],[18]	6.00%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		0.50%	[1],[2],[3],[4],[18]	0.50%	[5],[6],[7],[9],[23]
Principal amount		$ 57,700	[16],[17],[18]	$ 57,700	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	16,545
Ending balance	[18]	15,770
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares		67,490	[11],[16],[17],[18],[19]	67,490	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 30,453
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		3,084
Ending balance	[18],[19]	33,537
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			14.70%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			11.00%
Principal amount	[20],[22],[23]			$ 22,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	22,000
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt 1
Investments in and Advances to Affiliates, Activity [Line Items]
Principal amount	[16],[17],[18]	22,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[18]	$ 22,000
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt 2
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	14.70%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	11.00%
Principal amount	[11],[12]	$ 22,000
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	814
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		22,000
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance		22,000
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			10.00%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			6.00%
Principal amount	[20],[22],[23]			$ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 20,000
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	10.00%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	6.00%
Principal amount	[11],[12],[16],[18]	$ 20,000
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	506
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		20,000
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18]	20,000
Investment, Identifier [Axis]: J.R. Hobbs Co. – Atlanta, LLC – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares		10,920	[11],[12],[16],[18],[19]	10,920	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 9,236
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		947
Ending balance	[18],[19]	$ 10,183
Investment, Identifier [Axis]: Mason West, LLC – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		11,206	[16],[17],[18],[19]	11,206	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 19,235
Ending balance	[18],[19]	$ 20,047
Investment, Identifier [Axis]: Mason West, LLC – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.70%	[1],[2],[3],[4],[18]	13.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		10.00%	[1],[2],[3],[4],[18]	10.00%	[5],[6],[7],[9],[23]
Principal amount		$ 25,250	[16],[17],[18]	$ 25,250	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	25,250
Ending balance	[18]	$ 25,250
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[15],[18]	13.50%
Investment, reference rate and spread	[1],[2],[3],[4],[15],[18]	8.50%
Principal amount	[11],[12],[15],[16],[18]	$ 48,082
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	1,641
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		48,082
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[15],[18]	48,082
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. TL - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23],[26]			13.50%
Investment, reference rate and spread	[5],[6],[7],[9],[23],[26]			8.50%
Principal amount	[20],[22],[23],[26]			$ 48,082
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[26]	$ 48,082
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		22,169	[15],[16],[17],[18],[19]	22,169	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 14,641
Ending balance	[15],[18],[19]	14,886
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp.– Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares	[11],[12]	22,169
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 14,641
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		245
Ending balance		14,886
Investment, Identifier [Axis]: Old World Christmas, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares		6,180	[11],[12],[16],[18],[19]	6,180	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 29,730
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		2,847
Ending balance	[18],[19]	$ 32,577
Investment, Identifier [Axis]: Old World Christmas, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	13.20%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	9.50%
Principal amount	[11],[16],[17],[18]	$ 38,000
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	1,263
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		38,000
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18]	38,000
Investment, Identifier [Axis]: Old World Christmas, Inc. – Term Loan
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			13.20%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			9.50%
Principal amount	[20],[22],[23]			$ 38,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 38,000
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Line of Credit
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	7.00%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	1.00%
Line of credit facility, available	[1],[2],[3],[4],[18]	$ 0
Principal amount	[11],[16],[17],[18]	2,000
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	28
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,400
Gross Additions	[13]	600
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18]	2,000
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Line of Credit 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			7.00%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			1.00%
Line of credit facility, available	[5],[6],[7],[9],[23]			$ 600
Principal amount	[20],[22],[23]			$ 1,400
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	1,400
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares		428,773	[11],[12],[16],[18],[19]	428,773	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 4,928
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		582
Ending balance	[18],[19]	$ 5,510
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		7.00%	[1],[2],[3],[4],[18]	7.00%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		1.00%	[1],[2],[3],[4],[18]	1.00%	[5],[6],[7],[9],[23]
Principal amount		$ 400	[11],[12],[16],[18]	$ 400	[20],[22],[23]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	7
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	400
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18]	$ 400
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		10.70%	[1],[2],[3],[4],[18]	10.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		7.00%	[1],[2],[3],[4],[18]	7.00%	[5],[6],[7],[9],[23]
Line of credit facility, available		$ 0	[1],[2],[3],[4],[18]	$ 0	[5],[6],[7],[9],[23]
Principal amount		2,950	[16],[17],[18]	$ 2,950	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	2,950
Ending balance	[18]	$ 2,950
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Common Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		4,221	[16],[17],[18],[19]	4,221	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 0
Ending balance	[18],[19]	$ 136
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		14.70%	[1],[2],[3],[4],[18]	14.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		11.00%	[1],[2],[3],[4],[18]	11.00%	[5],[6],[7],[9],[23]
Principal amount		$ 3,200	[16],[17],[18]	$ 3,200	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	3,200
Ending balance	[18]	$ 3,200
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc. - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.00%	[1],[2],[3],[4],[18],[32]	13.00%	[5],[6],[7],[9],[23],[33]
Investment, reference rate and spread		8.00%	[1],[2],[3],[4],[18],[32]	8.00%	[5],[6],[7],[9],[23],[33]
Principal amount		$ 20,120	[11],[12],[16],[18],[32]	$ 20,120	[20],[22],[23],[33]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	661
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[33]	20,120
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18],[32]	20,120
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares	[11],[12]	7,060
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 1,835
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		1,785
Ending balance		$ 3,620
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc.. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		7,060	[16],[17],[18],[19],[32]	7,060	[20],[21],[22],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23],[33]	$ 1,835
Ending balance	[18],[19],[32]	$ 3,620
Investment, Identifier [Axis]: Rowan Energy Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		7,298	[16],[17],[18],[19]	7,298	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 7,495
Ending balance	[18],[19]	$ 4,065
Investment, Identifier [Axis]: Rowan Energy Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		14.50%	[1],[2],[3],[4],[18]	14.50%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		9.00%	[1],[2],[3],[4],[18]	9.00%	[5],[6],[7],[9],[23]
Principal amount		$ 25,790	[16],[17],[18]	$ 25,790	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	25,790
Ending balance	[18]	$ 25,790
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Common Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		18,721	[16],[17],[19],[34]	18,721	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 204,048
Ending balance	[19],[34]	167,361
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			12.50%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			7.00%
Principal amount	[20],[22],[23]			$ 54,644
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 54,644
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[34]	12.50%
Investment, reference rate and spread	[1],[2],[3],[4],[34]	7.00%
Principal amount	[16],[17],[34]	$ 54,644
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[34]	$ 54,644
Investment, Identifier [Axis]: Schylling, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		4,000	[16],[17],[18],[19]	4,000	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 66,403
Ending balance	[18],[19]	$ 69,829
Investment, Identifier [Axis]: Schylling, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		14.70%	[1],[2],[3],[4],[18]	14.70%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		11.00%	[1],[2],[3],[4],[18]	11.00%	[5],[6],[7],[9],[23]
Principal amount		$ 16,981	[16],[17],[18]	$ 16,981	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	16,981
Ending balance	[18]	$ 16,981
Investment, Identifier [Axis]: Smart Chemical Solutions, LLC - Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		13,843	[15],[16],[17],[18],[19]	13,843	[20],[21],[22],[23],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23],[26]	$ 7,327
Ending balance	[15],[18],[19]	$ 8,929
Investment, Identifier [Axis]: Smart Chemical Solutions, LLC – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.50%	[1],[2],[3],[4],[15],[18]	13.50%	[5],[6],[7],[9],[23],[26]
Investment, reference rate and spread		9.00%	[1],[2],[3],[4],[15],[18]	9.00%	[5],[6],[7],[9],[23],[26]
Principal amount		$ 35,660	[15],[16],[17],[18]	$ 35,660	[20],[22],[23],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23],[26]	35,660
Ending balance	[15],[18]	$ 35,660
Investment, Identifier [Axis]: Sun State Nursery and Landscaping, LLC – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		3,059	[16],[17],[18],[19]	3,059	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 3,718
Ending balance	[18],[19]	$ 4,271
Investment, Identifier [Axis]: Sun State Nursery and Landscaping, LLC – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.50%	[1],[2],[3],[4],[18]	13.50%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		9.00%	[1],[2],[3],[4],[18]	9.00%	[5],[6],[7],[9],[23]
Principal amount		$ 9,520	[16],[17],[18]	$ 9,520	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	9,520
Ending balance	[18]	$ 9,520
Investment, Identifier [Axis]: The E3 Company, LLC – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		11,233	[16],[17],[18],[19]	11,233	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 58,570
Ending balance	[18],[19]	$ 59,945
Investment, Identifier [Axis]: The E3 Company, LLC – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate		13.50%	[1],[2],[3],[4],[18]	13.50%	[5],[6],[7],[9],[23]
Investment, reference rate and spread		9.00%	[1],[2],[3],[4],[18]	9.00%	[5],[6],[7],[9],[23]
Principal amount		$ 33,750	[16],[17],[18]	$ 33,750	[20],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	33,750
Ending balance	[18]	33,750
Investment, Identifier [Axis]: The Maids International, LLC - Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares	[11],[12]	6,640
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 4,631
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		268
Ending balance		$ 4,899
Investment, Identifier [Axis]: The Maids International, LLC – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		6,640	[16],[17],[18],[19]	6,640	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 4,631
Ending balance	[18],[19]	$ 4,899
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	14.20%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	10.50%
Principal amount	[11],[16],[17],[18]	$ 28,560
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	1,021
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		28,560
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18]	28,560
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt 1
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			14.20%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			10.50%
Principal amount	[20],[22],[23]			$ 28,560
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	28,560
Investment, Identifier [Axis]: UPB Acquisition, Inc. - Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	$ 0
Principal Shares	[11],[12]	6,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 26,713
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		2,861
Ending balance		29,574
Investment, Identifier [Axis]: UPB Acquisition, Inc. - Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[5],[6],[7],[9],[23]			13.70%
Investment, reference rate and spread	[5],[6],[7],[9],[23]			10.00%
Principal amount	[20],[22],[23]			$ 11,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[23]	$ 11,000
Investment, Identifier [Axis]: UPB Acquisition, Inc. – Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Principal Shares		6,000	[16],[17],[18],[19]	6,000	[20],[21],[22],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[21],[23]	$ 26,713
Ending balance	[18],[19]	$ 29,574
Investment, Identifier [Axis]: UPB Acquisition, Inc. – Term Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment interest rate	[1],[2],[3],[4],[18]	13.70%
Investment, reference rate and spread	[1],[2],[3],[4],[18]	10.00%
Principal amount	[11],[16],[17],[18]	$ 11,000
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	379
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		11,000
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[18]	11,000
Diversified/Conglomerate Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		189,148
Ending balance		194,037
Electronics
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		62,723
Ending balance		62,968
Home and Office Furnishings, Housewares, and Durable Consumer Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		166,553
Ending balance		173,346
Leisure, Amusement, Motion Pictures, and Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		105,339
Ending balance		110,550
Mining, Steel, Iron and Non-Precious Metals
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		37,713
Ending balance		40,574
Telecommunications
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		7,942
Ending balance		7,459
Chemicals, Plastics, and Rubber
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		49,715
Ending balance		52,499
Secured First Lien Debt
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		570,602
Ending balance		564,631
Secured Second Lien Debt
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		99,197
Ending balance		102,789
Preferred Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		426,949
Ending balance		429,510
Common Equity/ Equivalents
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		212,500
Ending balance		185,090
Investment, Affiliate And Control
Investments in and Advances to Affiliates, Activity [Line Items]
Net Realized Gain (Loss) for Period		0
Amount of Investment Income	[10]	6,409
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		325,289
Gross Additions	[13]	600
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		11,967
Ending balance		$ 337,856
Affiliate Investments
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		52.20%	[1],[2],[3],[4],[35]	48.60%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	6,409
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	324,676
Gross Additions	[13]	600
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		12,076
Ending balance	[35]	$ 337,352
Affiliate Investments | Secured First Lien Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		30.10%	[1],[2],[3],[4],[35]	29.40%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	6,285
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	195,704
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(483)
Ending balance	[35]	$ 195,221
Affiliate Investments | Secured First Lien Debt | Diversified/Conglomerate Services
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		10.90%	[1],[2],[3],[4],[35]	10.60%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	2,341
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	70,560
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[35]	$ 70,560
Affiliate Investments | Secured First Lien Debt | Electronics
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		7.40%	[1],[2],[3],[4],[35]	7.20%	[5],[6],[7],[9],[26],[36]
Affiliate Investments | Secured First Lien Debt | Home and Office Furnishings, Housewares, and Durable Consumer Products
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		5.90%	[1],[2],[3],[4],[35]	5.70%	[5],[6],[7],[9],[36]
Affiliate Investments | Secured First Lien Debt | Leisure, Amusement, Motion Pictures, and Entertainment
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		3.10%	[1],[2],[3],[4],[35]	3.00%	[5],[6],[7],[9],[36]
Affiliate Investments | Secured First Lien Debt | Mining, Steel, Iron and Non-Precious Metals
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		1.70%	[1],[2],[3],[4],[35]	1.60%	[5],[6],[7],[9],[36]
Affiliate Investments | Secured First Lien Debt | Telecommunications
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		1.10%	[1],[2],[3],[4],[35]	1.30%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	7,942
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(483)
Ending balance	[35]	$ 7,459
Affiliate Investments | Secured Second Lien Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.40%	[1],[2],[3],[4],[35]	0.30%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	35
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	1,800
Gross Additions	[13]	600
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[35]	$ 2,400
Affiliate Investments | Secured Second Lien Debt | Chemicals, Plastics, and Rubber
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.40%	[1],[2],[3],[4],[35]	0.30%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	35
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,800
Gross Additions	[13]	600
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[35]	$ 2,400
Affiliate Investments | Preferred Equity
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		20.90%	[1],[2],[3],[4],[35]	18.20%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	122,167
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		12,619
Ending balance	[35]	$ 134,786
Affiliate Investments | Preferred Equity | Diversified/Conglomerate Services
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		7.50%	[1],[2],[3],[4],[35]	6.60%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	44,320
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		4,299
Ending balance	[35]	$ 48,619
Affiliate Investments | Preferred Equity | Electronics
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		2.30%	[1],[2],[3],[4],[35]	2.20%	[5],[6],[7],[9],[36]
Affiliate Investments | Preferred Equity | Home and Office Furnishings, Housewares, and Durable Consumer Products
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		5.00%	[1],[2],[3],[4],[35]	4.40%	[5],[6],[7],[9],[36]
Affiliate Investments | Preferred Equity | Leisure, Amusement, Motion Pictures, and Entertainment
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.60%	[1],[2],[3],[4],[35]	0.30%	[5],[6],[7],[9],[36]
Affiliate Investments | Preferred Equity | Mining, Steel, Iron and Non-Precious Metals
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		4.60%	[1],[2],[3],[4],[35]	4.00%	[5],[6],[7],[9],[36]
Affiliate Investments | Preferred Equity | Telecommunications
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.00%	[1],[2],[3],[4],[35]	0.00%	[5],[6],[7],[9],[36]
Affiliate Investments | Preferred Equity | Chemicals, Plastics, and Rubber
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.90%	[1],[2],[3],[4],[35]	0.70%	[5],[6],[7],[9],[36]
Affiliate Investments | Common Equity/ Equivalents
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.80%	[1],[2],[3],[4],[35]	0.70%	[5],[6],[7],[9],[36]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	89
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[36]	5,005
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(60)
Ending balance	[35]	$ 4,945
Affiliate Investments | Common Equity/ Equivalents | Telecommunications
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.00%	[1],[2],[3],[4],[35]	0.00%	[5],[6],[7],[9],[36]
Control Investments
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.10%	[1],[2],[3],[4],[37]	0.10%	[5],[6],[7],[9],[38]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[38]	613
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(109)
Ending balance	[37]	$ 504
Control Investments | Secured First Lien Debt
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.10%	[1],[2],[3],[4],[37]	0.10%	[5],[6],[7],[9],[38]
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[38]	613
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		(109)
Ending balance	[37]	$ 504
Control Investments | Secured First Lien Debt | Diversified/Conglomerate Manufacturing
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.10%	[1],[2],[3],[4],[37]	0.10%	[5],[6],[7],[9],[38]
Control Investments | Preferred Equity
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets	[5],[6],[7],[9],[38]			0.00%
Net Realized Gain (Loss) for Period		$ 0
Amount of Investment Income	[10]	0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[38]	0
Gross Additions	[13]	0
Gross Reductions	[14]	0
Net Unrealized Appreciation (Depreciation)		0
Ending balance	[37]	$ 0
Control Investments | Preferred Equity | Diversified/Conglomerate Manufacturing
Investments in and Advances to Affiliates, Activity [Line Items]
Investment owned, percent of net assets		0.00%	[1],[2],[3],[4],[37]	0.00%	[5],[6],[7],[9],[38]
[1] Category percentages represent the fair value of each category and subcategory as a percentage of net assets as of June 30, 2026. [2] Certain of the securities listed are issued by affiliate(s) of the indicated portfolio company. The majority of the securities listed, totaling $1.1 billion at fair value, are pledged as collateral to our revolving line of credit, as described further in Note 5 — Borrowings in the accompanying Notes to Consolidated Financial Statements. Additionally, under Section 55 of the Investment Company Act of 1940, as amended (the "1940 Act"), we may not acquire any non-qualifying assets unless, at the time such acquisition is made, qualifying assets represent at least 70% of our total assets. As of June 30, 2026, our investments in Pyrotek Special Effects, Inc. ("Pyrotek") and Gladstone Alternative Income Fund ("Gladstone Alternative") are considered non-qualifying assets under Section 55 of the 1940 Act. Such non-qualifying assets represent 2.2% of total investments, at fair value, as of June 30, 2026. [3] Unless indicated otherwise, all cash interest rates are indexed to 30-day Secured Overnight Financing Rate ("SOFR"), which was 3.7% as of June 30, 2026. If applicable, paid-in-kind interest rates are noted separately from the cash interest rate. Certain securities are subject to an interest rate floor. The cash interest rate is the greater of the floor or the reference rate plus a spread. Due dates represent the contractual maturity date. [4] Unless indicated otherwise, all of our investments are valued using Level 3 inputs within the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 820, "Fair Value Measurement" ("ASC 820") fair value hierarchy. Refer to Note 3 — Investments in the accompanying Notes to Consolidated Financial Statements for additional information. [5] Unless indicated otherwise, all cash interest rates are indexed to 30-day SOFR, which was 3.7% as of March 31, 2026. If applicable, paid-in-kind interest rates are noted separately from the cash interest rate. Certain securities are subject to an interest rate floor. The cash interest rate is the greater of the floor or the reference rate plus a spread. Due dates represent the contractual maturity date. [6] Category percentages represent the fair value of each category and subcategory as a percentage of net assets as of March 31, 2026. [7] Certain of the securities listed are issued by affiliate(s) of the indicated portfolio company. The majority of the securities listed, totaling $1.2 billion at fair value, are pledged as collateral to our revolving line of credit, as described further in Note 5 — Borrowings in the accompanying Notes to Consolidated Financial Statements. Additionally, under Section 55 of the 1940 Act, we may not acquire any non-qualifying assets unless, at the time such acquisition is made, qualifying assets represent at least 70% of our total assets. As of March 31, 2026, our investments in Pyrotek and Gladstone Alternative are considered non-qualifying assets under Section 55 of the 1940 Act. Such non-qualifying assets represent 2.1% of total investments, at fair value, as of March 31, 2026. [8] Cumulative gross unrealized appreciation for federal income tax purposes is $428.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $173.7 million. Cumulative net unrealized appreciation is $254.8 million, based on a tax cost of $1.1 billion. [9] Unless indicated otherwise, all of our investments are valued using Level 3 inputs within the ASC 820 fair value hierarchy. Refer to Note 3 —Investments in the accompanying Notes to Consolidated Financial Statements for additional information. [10] Represents the total amount of interest, dividend, success fee, or other investment income credited to income for the portion of the three months ended June 30, 2026 an investment was an affiliate investment or control investment and on accrual status, as appropriate. [11] Represents the principal balance, presented in thousands, for debt investments and the number of shares/units held for equity investments as of June 30, 2026. Warrants are represented as a percentage of ownership, as applicable, as of June 30, 2026. [12] Where applicable, aggregates all shares of a class of stock owned without regard to specific series owned within such class (some series of which may or may not be voting shares) or aggregates all warrants to purchase shares of a class of stock owned without regard to specific series of such class of stock such warrants allow us to purchase. [13] Gross additions include increases in investments resulting from new portfolio investments, the amortization of discounts and fees, and the exchange of one or more existing securities for one or more new securities during the three months ended June 30, 2026. [14] Gross reductions include decreases in investments resulting from principal collections related to investment repayments or sales, the amortization of premiums and acquisition costs, and the exchange of one or more existing securities for one or more new securities during the three months ended June 30, 2026. [15] One or more of our affiliated funds, Gladstone Capital Corporation and Gladstone Alternative, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission. [16] Represents the principal balance, presented in thousands, for debt investments, the cash balance, presented in thousands, for cash equivalents, and the number of shares/units held for equity investments. Warrants are represented as a percentage of ownership, as applicable. [17] Where applicable, aggregates all shares of a class of stock owned without regard to specific series owned within such class (some series of which may or may not be voting shares) or aggregates all warrants to purchase shares of a class of stock owned without regard to specific series of such class of stock such warrants allow us to purchase. [18] Fair value was based on the total enterprise value of the portfolio company, which is generally allocated to the portfolio company’s securities in order of their relative priority in the capital structure. Refer to Note 3 — Investments in the accompanying Notes to Consolidated Financial Statements for additional information. [19] Security is non-income producing [20] Represents the principal balance, presented in thousands, for debt investments, the cash balance, presented in thousands, for cash equivalents, and the number of shares/units held for equity investments. Warrants are represented as a percentage of ownership, as applicable. [21] Security is non-income producing. [22] Where applicable, aggregates all shares of a class of stock owned without regard to specific series owned within such class (some series of which may or may not be voting shares) or aggregates all warrants to purchase shares of a class of stock owned without regard to specific series of such class of stock such warrants allow us to purchase. [23] Fair value was based on the total enterprise value of the portfolio company, which is generally allocated to the portfolio company’s securities in order of their relative priority in the capital structure. Refer to Note 3 — Investments in the accompanying Notes to Consolidated Financial Statements for additional information. [24] Debt security is on non-accrual status. [25] Debt security is on non-accrual status. [26] One or more of our affiliated funds, Gladstone Capital Corporation and Gladstone Alternative, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission. [27] The portfolio company changed its name from Ricardo Defense, Inc. to Detroit Defense, Inc. during the year ended March 31, 2026. [28] Valued using Level 1 inputs within the FASB ASC 820 fair value hierarchy. Refer to Note 3 — Investments in the accompanying Notes to Consolidated Financial Statements for additional information. [29] Valued using Level 1 inputs within the FASB ASC 820 fair value hierarchy. Refer to Note 3 — Investments in the accompanying Notes to Consolidated Financial Statements for additional information. [30] Fair value was based on net asset value provided by the underlying fund as a practical expedient. [31] Fair value was based on net asset value provided by the underlying fund as a practical expedient. [32] This portfolio company is headquartered in Ontario, Canada. [33] This portfolio company is headquartered in Ontario, Canada. [34] Fair value was based on the expected exit. [35] Affiliate investments, as defined by the 1940 Act, are those that are not Control investments and in which we own, with the power to vote, between and inclusive of 5.0% and 25.0% of the issued and outstanding voting securities. [36] Affiliate investments, as defined by the 1940 Act, are those that are not Control investments and in which we own, with the power to vote, between and inclusive of 5.0% and 25.0% of the issued and outstanding voting securities. [37] Control investments, as defined by the 1940 Act, are those where we have the power to exercise a controlling influence over the management or policies of the portfolio company, which may include owning, with the power to vote, more than 25.0% of the issued and outstanding voting securities. [38] Control investments, as defined by the 1940 Act, are those where we have the power to exercise a controlling influence over the management or policies of the portfolio company, which may include owning, with the power to vote, more than 25.0% of the issued and outstanding voting securities.