Annual report [Section 13 and 15(d), not S-K Item 405]

CONSOLIDATED SCHEDULE OF INVESTMENTS (Parenthetical)

v3.26.1
CONSOLIDATED SCHEDULE OF INVESTMENTS (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 195.90% [1],[2],[3],[4],[5] 196.20% [6],[7],[8],[9],[10]
Cash equivalents, net assets, percentage 0.00% [1],[2],[4],[5] 0.30% [6],[7],[9],[10]
Investment and cash equivalents, net assets, percentage 195.90% [1],[2],[4],[5] 196.50% [6],[7],[9],[10]
Investments owned, fair value $ 1,309,248 [3] $ 979,320 [8]
Percentage threshold of qualified assets representing total assets in order to acquire non-qualified assets 70.00% 70.00%
Investment, interest rate, paid in cash 3.70% 4.30%
Cumulative net unrealized appreciation $ 428,500 $ 183,300
Cumulative gross unrealized depreciation 173,700 144,900
Cumulative gross unrealized appreciation for federal income tax purposes 254,800 38,500
Based on a tax cost $ 1,100,000 $ 940,900
Pyrotek Special Effects, Inc. And Gladstone Alternative    
Schedule of Investments [Line Items]    
Percentage of acquired non-qualifying assets of total assets 2.10% 3.60%
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. - Common Stock Warrants    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 $ 0
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Common Stock Warrants    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 [11],[12],[13],[14] $ 0 [15],[16],[17],[18]
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 2.00% [1],[2],[4],[5],[11],[13],[14],[19] 2.00% [6],[7],[9],[10],[15],[17],[18],[20]
Investment interest rate 7.00% [1],[2],[4],[5],[11],[13],[14],[19] 7.00% [6],[7],[9],[10],[15],[17],[18],[20]
Line of credit facility, available $ 0 [1],[2],[4],[5],[11],[13],[14],[19] $ 0 [6],[7],[9],[10],[15],[17],[18],[20]
Investments owned, fair value $ 3,080 [11],[13],[14],[19] $ 3,080 [15],[17],[18],[20]
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit 2    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 2.00% [1],[2],[4],[5],[11],[13],[14],[19] 2.00% [6],[7],[9],[10],[15],[17],[18],[20]
Investment interest rate 7.00% [1],[2],[4],[5],[11],[13],[14],[19] 7.00% [6],[7],[9],[10],[15],[17],[18],[20]
Line of credit facility, available $ 0 [1],[2],[4],[5],[11],[13],[14],[19] $ 120 [6],[7],[9],[10],[15],[17],[18],[20]
Investments owned, fair value 1,050 [11],[13],[14],[19] 930 [15],[17],[18],[20]
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 0 [15],[16],[17],[18]
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[11],[13],[14],[19] 2.00%  
Investment interest rate [1],[2],[4],[5],[11],[13],[14],[19] 7.00%  
Investments owned, fair value $ 3,812 [11],[13],[14],[19] $ 3,575
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[15],[17],[18],[20]   2.00%
Investment interest rate [6],[7],[9],[10],[15],[17],[18],[20]   7.00%
Investments owned, fair value [15],[17],[18],[20]   $ 3,575
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.– Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [11],[12],[13],[14] 0  
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 49,815 [12],[13] $ 51,877 [16],[17]
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 10.00% [1],[2],[4],[5],[13] 10.00% [6],[7],[9],[10],[17]
Investment interest rate 13.70% [1],[2],[4],[5],[13] 14.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 17,700 [13] $ 17,700 [17]
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 2    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 10.00% [1],[2],[4],[5],[13] 10.00% [6],[7],[9],[10],[17]
Investment interest rate 13.70% [1],[2],[4],[5],[13] 14.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 6,850 [13] $ 6,850 [17]
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. - Preferred Equity    
Schedule of Investments [Line Items]    
Investments owned, fair value [16],[17]   $ 31,070
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. – Preferred Equity    
Schedule of Investments [Line Items]    
Investments owned, fair value [12],[13] $ 30,737  
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 11.00% [1],[2],[4],[5],[13] 11.00% [6],[7],[9],[10],[17]
Investment interest rate 14.70% [1],[2],[4],[5],[13] 15.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 38,250 [13] $ 38,250 [17]
Investment, Identifier [Axis]: Detroit Defense, Inc. - Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [11],[12],[13],[21] $ 12,572  
Investment, Identifier [Axis]: Detroit Defense, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[11],[13],[21] 9.00%  
Investment interest rate [1],[2],[4],[5],[11],[13],[21] 13.00%  
Investments owned, fair value [11],[13],[21] $ 61,305  
Investment, Identifier [Axis]: Diligent Delivery Systems – Common Stock Warrants    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 [12],[13] $ 0 [16],[17]
Investment, Identifier [Axis]: Diligent Delivery Systems – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 9.00% [1],[2],[4],[5],[13],[19] 9.00% [6],[7],[9],[10],[20],[22]
Investment interest rate 12.70% [1],[2],[4],[5],[13],[19] 13.30% [6],[7],[9],[10],[20],[22]
Investments owned, fair value $ 512 [13],[19] $ 12,624 [20],[22]
Investment, Identifier [Axis]: Dreyfus Treasury Obligations Cash Management Fund    
Schedule of Investments [Line Items]    
Investment interest rate 3.30% [1],[2],[4],[5],[23] 3.97% [6],[7],[9],[10],[24]
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 [11],[12],[13] $ 0 [15],[16],[17]
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[15],[17],[20]   5.50%
Investment interest rate [6],[7],[9],[10],[15],[17],[20]   9.80%
Investments owned, fair value [15],[17],[20]   $ 343
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[11],[13],[19] 5.50%  
Investment interest rate [1],[2],[4],[5],[11],[13],[19] 9.20%  
Investments owned, fair value $ 613 [11],[13],[19] 343
Investment, Identifier [Axis]: Educators Resource, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 11,630 [12],[13] $ 21,501 [16],[17]
Investment, Identifier [Axis]: Educators Resource, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 10.50% [1],[2],[4],[5],[13] 10.50% [6],[7],[9],[10],[17]
Investment interest rate 14.20% [1],[2],[4],[5],[13] 14.80% [6],[7],[9],[10],[17]
Investments owned, fair value $ 30,000 [13] $ 30,000 [17]
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Common Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 3,447 [12],[13] $ 3,480 [16],[17]
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 4.10% [1],[2],[4],[5],[13] 4.10% [6],[7],[9],[10],[17]
Investment interest rate 7.80% [1],[2],[4],[5],[13] 8.40% [6],[7],[9],[10],[17]
Investments owned, fair value $ 6,900 [13] $ 6,900 [17]
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 2    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 7.00% [1],[2],[4],[5],[13] 7.00% [6],[7],[9],[10],[17]
Investment interest rate 10.70% [1],[2],[4],[5],[13] 11.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 18,796 [13] $ 18,796 [17]
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Common Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 0 [12],[13] 0 [16],[17]
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 12,258 [12],[13] $ 9,070 [16],[17]
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 10.00% [1],[2],[4],[5],[13] 10.00% [6],[7],[9],[10],[17]
Investment interest rate 13.70% [1],[2],[4],[5],[13] 14.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 12,200 [13] $ 12,200 [17]
Investment, Identifier [Axis]: Gladstone Alternative Income Fund – Common Equity    
Schedule of Investments [Line Items]    
Investments owned, fair value 5,005 [12],[14],[25] 4,975
Investment, Identifier [Axis]: Gladstone Alternative Income Fund. – Common Equity    
Schedule of Investments [Line Items]    
Investments owned, fair value [16],[18],[26]   $ 4,975
Investment, Identifier [Axis]: Global GRAB Technologies, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [12],[13] $ 25,022  
Investment, Identifier [Axis]: Global GRAB Technologies, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[11],[13],[21] 9.00%  
Investment interest rate [1],[2],[4],[5],[11],[13],[21] 13.50%  
Investments owned, fair value $ 46,500  
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. – Line of Credit 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17]   6.00%
Investment interest rate [6],[7],[9],[10],[17]   10.30%
Line of credit facility, available [6],[7],[9],[10],[17]   $ 0
Investments owned, fair value [17]   $ 2,000
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. – Line of Credit 2    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17]   6.00%
Investment interest rate [6],[7],[9],[10],[17]   10.30%
Line of credit facility, available [6],[7],[9],[10],[17]   $ 0
Investments owned, fair value [17]   400
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 [12],[13] $ 0 [16],[17]
Investment, Identifier [Axis]: Home Concepts Acquisition, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 9.00% [1],[2],[4],[5],[13] 9.00% [6],[7],[9],[10],[17]
Investment interest rate 13.00% [1],[2],[4],[5],[13] 13.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 8,379 [13] $ 9,281 [17]
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 [12],[13] $ 0 [16],[17]
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 0.50% [1],[2],[4],[5],[13] 0.50% [6],[7],[9],[10],[17]
Investment interest rate 6.00% [1],[2],[4],[5],[13] 6.00% [6],[7],[9],[10],[17]
Investments owned, fair value $ 16,545 [13] $ 29,634 [17]
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 30,453 [12],[13],[14] $ 12,921 [16],[17],[18]
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investments owned, fair value [13],[14] $ 22,000  
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 11.00% [1],[2],[4],[5],[13],[14] 11.00% [6],[7],[9],[10],[17],[18]
Investment interest rate 14.70% [1],[2],[4],[5],[13],[14] 15.30% [6],[7],[9],[10],[17],[18]
Investments owned, fair value $ 22,000 $ 22,000 [17],[18]
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Line of Credit    
Schedule of Investments [Line Items]    
Investments owned, fair value 0 $ 3,036
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18],[20]   6.00%
Investment interest rate [6],[7],[9],[10],[17],[18],[20]   10.30%
Investments owned, fair value $ 0 $ 10,019 [17],[18],[20]
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 2    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18],[20]   10.30%
Investment interest rate [6],[7],[9],[10],[17],[18],[20]   14.60%
Investments owned, fair value [17],[18],[20]   $ 15,788
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 3    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18],[20]   6.00%
Investment interest rate [6],[7],[9],[10],[17],[18],[20]   10.30%
Investments owned, fair value [17],[18],[20]   $ 1,480
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Line of Credit    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18],[20]   6.00%
Investment interest rate [6],[7],[9],[10],[17],[18],[20]   10.30%
Line of credit facility, available [6],[7],[9],[10],[17],[18],[20]   $ 0
Investments owned, fair value [17],[18],[20]   3,036
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13],[14] 6.00%  
Investment interest rate [1],[2],[4],[5],[13],[14] 10.00%  
Investments owned, fair value $ 20,000 [13],[14] 15,788
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 2    
Schedule of Investments [Line Items]    
Investments owned, fair value 0 1,480
Investment, Identifier [Axis]: J.R. Hobbs Co. – Atlanta, LLC – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 9,236 [12],[13],[14] 0 [16],[17],[18]
Investment, Identifier [Axis]: Mason West, LLC – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 19,235 [12],[13] $ 13,262 [16],[17]
Investment, Identifier [Axis]: Mason West, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 10.00% [1],[2],[4],[5],[13] 10.00% [6],[7],[9],[10],[17]
Investment interest rate 13.70% [1],[2],[4],[5],[13] 14.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 25,250 [13] $ 25,250 [17]
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. - Term Debt    
Schedule of Investments [Line Items]    
Investments owned, fair value [11],[13],[14] 48,082  
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. Line of Credit    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[15],[17],[18]   5.00%
Investment interest rate [6],[7],[9],[10],[15],[17],[18]   10.00%
Line of credit facility, available [6],[7],[9],[10],[15],[17],[18]   $ 2,820
Investments owned, fair value [15],[17],[18]   $ 1,070
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. TL - Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[15],[17],[18]   8.50%
Investment interest rate [6],[7],[9],[10],[15],[17],[18]   13.50%
Investments owned, fair value [15],[17],[18]   $ 48,082
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 14,641 [11],[12],[13],[14] 22,421 [15],[16],[17],[18]
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[11],[13],[14] 8.50%  
Investment interest rate [1],[2],[4],[5],[11],[13],[14] 13.50%  
Investments owned, fair value $ 48,082 48,082
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp.– Line of Credit    
Schedule of Investments [Line Items]    
Investments owned, fair value 0 1,070
Investment, Identifier [Axis]: Nielsen-Kellerman Acquisition Corp.– Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 14,641 22,421
Investment, Identifier [Axis]: Old World Christmas, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 29,730 [12],[13],[14] $ 23,539 [16],[17],[18]
Investment, Identifier [Axis]: Old World Christmas, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 9.50% [1],[2],[4],[5],[13],[14] 9.50% [6],[7],[9],[10],[17],[18]
Investment interest rate 13.20% [1],[2],[4],[5],[13],[14] 13.80% [6],[7],[9],[10],[17],[18]
Investments owned, fair value $ 38,000 [13],[14] $ 38,000 [17],[18]
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Line of Credit    
Schedule of Investments [Line Items]    
Investments owned, fair value [13],[14] 1,400  
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investments owned, fair value [13],[14] $ 400  
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Line of Credit    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13],[14] 1.00%  
Investment interest rate [1],[2],[4],[5],[13],[14] 7.00%  
Line of credit facility, available [1],[2],[4],[5],[13],[14] $ 600  
Investments owned, fair value 1,400 0
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 4,928 [12],[13],[14] 996 [16],[17],[18]
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock(O)    
Schedule of Investments [Line Items]    
Investments owned, fair value 4,928 $ 996
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18]   1.00%
Investment interest rate [6],[7],[9],[10],[17],[18]   7.00%
Investments owned, fair value [17],[18]   $ 10,616
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt 1    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13],[14]   1.00%
Investment interest rate [1],[2],[4],[5],[13],[14]   7.00%
Investments owned, fair value 400 $ 0
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt 2    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 10,616
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13] 7.00%  
Investment interest rate [1],[2],[4],[5],[13] 10.70%  
Line of credit facility, available [1],[2],[4],[5],[13] $ 0  
Unused fee percentage [1],[2],[4],[5],[13] 0.30%  
Investments owned, fair value [13] $ 2,950  
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Common Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 0 [12],[13] $ 0 [16],[17]
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Line of Credit    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17]   1.40%
Investment interest rate [6],[7],[9],[10],[17]   5.70%
Line of credit facility, available [6],[7],[9],[10],[17]   $ 0
Unused fee percentage [6],[7],[9],[10],[17]   0.30%
Investments owned, fair value [17]   $ 2,950
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 11.00% [1],[2],[4],[5],[13] 3.40% [6],[7],[9],[10],[17]
Investment interest rate 14.70% [1],[2],[4],[5],[13] 7.70% [6],[7],[9],[10],[17]
Investments owned, fair value $ 3,200 [13] $ 3,200 [17]
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc. - Line of Credit    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18],[27]   5.00%
Investment interest rate [6],[7],[9],[10],[17],[18],[27]   10.00%
Line of credit facility, available [6],[7],[9],[10],[17],[18],[27]   $ 500
Investments owned, fair value [17],[18],[27]   $ 2,500
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc. - Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18],[27]   8.00%
Investment interest rate [6],[7],[9],[10],[17],[18],[27]   13.00%
Investments owned, fair value 20,120 [13],[14],[28] $ 20,120 [17],[18],[27]
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 1,835 7,260
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13],[14],[28] 8.00%  
Investment interest rate [1],[2],[4],[5],[13],[14],[28] 13.00%  
Investments owned, fair value $ 20,120 20,120
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc.. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 1,835 [12],[13],[14],[28] 7,260 [16],[17],[18],[27]
Investment, Identifier [Axis]: Pyrotek Special Effects, Inc.– Line of Credit    
Schedule of Investments [Line Items]    
Investments owned, fair value 0 2,500
Investment, Identifier [Axis]: Ricardo Defense, Inc. - Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [15],[16],[17]   $ 17,388
Investment, Identifier [Axis]: Ricardo Defense, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[15],[17]   9.00%
Investment interest rate [6],[7],[9],[10],[15],[17]   13.30%
Investments owned, fair value [15],[17]   $ 61,305
Investment, Identifier [Axis]: Rowan Energy Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [12],[13] $ 7,495  
Investment, Identifier [Axis]: Rowan Energy Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13] 9.00%  
Investment interest rate [1],[2],[4],[5],[13] 14.50%  
Investments owned, fair value [13] $ 25,790  
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Common Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 204,048 [12],[13] $ 50,788 [16],[17]
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17]   7.00%
Investment interest rate [6],[7],[9],[10],[17]   12.50%
Investments owned, fair value [17]   $ 54,644
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13] 7.00%  
Investment interest rate [1],[2],[4],[5],[13] 12.50%  
Investments owned, fair value [13] $ 54,644  
Investment, Identifier [Axis]: Schylling, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 66,403 [12],[13] $ 20,599 [16],[17]
Investment, Identifier [Axis]: Schylling, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread 11.00% [1],[2],[4],[5],[13] 11.00% [6],[7],[9],[10],[17]
Investment interest rate 14.70% [1],[2],[4],[5],[13] 15.30% [6],[7],[9],[10],[17]
Investments owned, fair value $ 16,981 [13] $ 27,981 [17]
Investment, Identifier [Axis]: Smart Chemical Solutions, LLC - Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [11],[12],[13] $ 7,327  
Investment, Identifier [Axis]: Smart Chemical Solutions, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[11],[13] 9.00%  
Investment interest rate [1],[2],[4],[5],[11],[13] 13.50%  
Investments owned, fair value [11],[13] $ 35,660  
Investment, Identifier [Axis]: Sun State Nursery and Landscaping, LLC – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [12],[13] $ 3,718  
Investment, Identifier [Axis]: Sun State Nursery and Landscaping, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13] 9.00%  
Investment interest rate [1],[2],[4],[5],[13] 13.50%  
Investments owned, fair value [13] $ 9,520  
Investment, Identifier [Axis]: The E3 Company, LLC – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 58,570 [12],[13] $ 35,839 [16],[17]
Investment, Identifier [Axis]: The E3 Company, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17]   9.00%
Investment interest rate [6],[7],[9],[10],[17]   13.50%
Investments owned, fair value [17]   $ 33,750
Investment, Identifier [Axis]: The E3 Company, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13] 9.00%  
Investment interest rate [1],[2],[4],[5],[13] 13.50%  
Investments owned, fair value [13] $ 33,750  
Investment, Identifier [Axis]: The Maids International, LLC - Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value 4,631 8,410
Investment, Identifier [Axis]: The Maids International, LLC – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 4,631 [12],[13],[14] $ 8,410 [16],[17],[18]
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18]   10.50%
Investment interest rate [6],[7],[9],[10],[17],[18]   14.80%
Investments owned, fair value [17],[18]   $ 28,560
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13],[14] 10.50%  
Investment interest rate [1],[2],[4],[5],[13],[14] 14.20%  
Investments owned, fair value $ 28,560 [13],[14] 28,560
Investment, Identifier [Axis]: UPB Acquisition, Inc – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [12],[13],[14] 26,713  
Investment, Identifier [Axis]: UPB Acquisition, Inc. - Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 26,713 26,010
Investment, Identifier [Axis]: UPB Acquisition, Inc. – Preferred Stock    
Schedule of Investments [Line Items]    
Investments owned, fair value [16],[17],[18]   26,010
Investment, Identifier [Axis]: UPB Acquisition, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [1],[2],[4],[5],[13],[14] 10.00%  
Investment interest rate [1],[2],[4],[5],[13],[14] 13.70%  
Investments owned, fair value $ 11,000 [13],[14] $ 15,000
Investment, Identifier [Axis]: UPB Acquisition, Inc. – Term Debt    
Schedule of Investments [Line Items]    
Investment, reference rate and spread [6],[7],[9],[10],[17],[18]   10.00%
Investment interest rate [6],[7],[9],[10],[17],[18]   14.30%
Investments owned, fair value [17],[18]   $ 15,000
Collateral Pledged    
Schedule of Investments [Line Items]    
Investments owned, fair value 1,200,000 764,700
Aerospace and Defense    
Schedule of Investments [Line Items]    
Investments owned, fair value 174,542 107,869
Buildings and Real Estate    
Schedule of Investments [Line Items]    
Investments owned, fair value 68,987 69,320
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Investments owned, fair value 49,715 11,612
Diversified/Conglomerate Manufacturing    
Schedule of Investments [Line Items]    
Investments owned, fair value 6,763 6,493
Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investments owned, fair value 189,148 170,360
Healthcare, Education, and Childcare    
Schedule of Investments [Line Items]    
Investments owned, fair value 41,630 51,501
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Schedule of Investments [Line Items]    
Investments owned, fair value 166,553 159,236
Leisure, Amusement, Motion Pictures, and Entertainment    
Schedule of Investments [Line Items]    
Investments owned, fair value 105,339 78,460
Oil and Gas    
Schedule of Investments [Line Items]    
Investments owned, fair value 125,605 69,589
Printing and Publishing    
Schedule of Investments [Line Items]    
Investments owned, fair value 8,379 11,681
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Schedule of Investments [Line Items]    
Investments owned, fair value 258,692 105,432
Electronics    
Schedule of Investments [Line Items]    
Investments owned, fair value 62,723 71,573
Mining, Steel, Iron and Non-Precious Metals    
Schedule of Investments [Line Items]    
Investments owned, fair value 37,713 41,010
Telecommunications    
Schedule of Investments [Line Items]    
Investments owned, fair value 7,942 7,585
Secured First Lien Debt    
Schedule of Investments [Line Items]    
Investments owned, fair value 570,602 514,334
Secured Second Lien Debt    
Schedule of Investments [Line Items]    
Investments owned, fair value 99,197 103,580
Preferred Equity    
Schedule of Investments [Line Items]    
Investments owned, fair value 426,949 302,163
Common Equity/ Equivalents    
Schedule of Investments [Line Items]    
Investments owned, fair value $ 212,500 $ 59,243
Non-Control/Non-Affiliate investments    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 147.20% [1],[2],[4],[5],[29] 130.00% [6],[7],[9],[10],[30]
Investments owned, fair value $ 983,959 [29] $ 648,589 [30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 56.00% [1],[2],[4],[5],[29] 60.30% [6],[7],[9],[10],[30]
Investments owned, fair value $ 374,285 [29] $ 300,751 [30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Aerospace and Defense    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 16.10% [1],[2],[4],[5],[29] 12.30% [6],[7],[9],[10],[30]
Investments owned, fair value [29] $ 107,805  
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Buildings and Real Estate    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 5.70% [1],[2],[4],[5],[29] 7.70% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets [1],[2],[4],[5],[29] 5.30%  
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Diversified/Conglomerate Manufacturing    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.90% [1],[2],[4],[5],[29] 1.20% [6],[7],[9],[10],[30]
Investments owned, fair value $ 6,150 [29] $ 6,150 [30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 5.20% [1],[2],[4],[5],[29] 11.00% [6],[7],[9],[10],[30]
Investments owned, fair value $ 34,770 [29] $ 54,884 [30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Healthcare, Education, and Childcare    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 4.50% [1],[2],[4],[5],[29] 6.00% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 5.50% [1],[2],[4],[5],[29] 7.40% [6],[7],[9],[10],[30]
Investments owned, fair value $ 36,750 [29] $ 36,750 [30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Leisure, Amusement, Motion Pictures, and Entertainment    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 2.50% [1],[2],[4],[5],[29] 5.60% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Oil and Gas    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 9.00% [1],[2],[4],[5],[29] 6.80% [6],[7],[9],[10],[30]
Investments owned, fair value [29] $ 59,540  
Non-Control/Non-Affiliate investments | Secured First Lien Debt | Printing and Publishing    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 1.30% [1],[2],[4],[5],[29] 2.30% [6],[7],[9],[10],[30]
Investments owned, fair value [30]   $ 11,681
Non-Control/Non-Affiliate investments | Secured Second Lien Debt    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 14.60% [1],[2],[4],[5],[29] 18.60% [6],[7],[9],[10],[30]
Investments owned, fair value $ 97,397 [29] $ 92,964 [30]
Non-Control/Non-Affiliate investments | Secured Second Lien Debt | Aerospace and Defense    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 3.80% [1],[2],[4],[5],[29] 5.20% [6],[7],[9],[10],[30]
Investments owned, fair value $ 25,696 [29] $ 25,696 [30]
Non-Control/Non-Affiliate investments | Secured Second Lien Debt | Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets [1],[2],[4],[5],[29] 2.50%  
Non-Control/Non-Affiliate investments | Secured Second Lien Debt | Cargo Transport    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.10% [1],[2],[4],[5],[29] 2.50% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Secured Second Lien Debt | Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 8.20% [1],[2],[4],[5],[29] 10.90% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Preferred Equity    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 45.60% [1],[2],[4],[5],[29] 40.20% [6],[7],[9],[10],[30]
Investments owned, fair value $ 304,782 [29] $ 200,606 [30]
Non-Control/Non-Affiliate investments | Preferred Equity | Aerospace and Defense    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 5.60% [1],[2],[4],[5],[29] 3.50% [6],[7],[9],[10],[30]
Investments owned, fair value [29] $ 37,594  
Non-Control/Non-Affiliate investments | Preferred Equity | Buildings and Real Estate    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 4.60% [1],[2],[4],[5],[29] 6.20% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Preferred Equity | Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets [1],[2],[4],[5],[29] 1.10%  
Non-Control/Non-Affiliate investments | Preferred Equity | Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 3.50% [1],[2],[4],[5],[29] 2.70% [6],[7],[9],[10],[30]
Investments owned, fair value $ 22,953 [29] $ 13,262 [30]
Non-Control/Non-Affiliate investments | Preferred Equity | Healthcare, Education, and Childcare    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 1.70% [1],[2],[4],[5],[29] 4.30% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Preferred Equity | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 9.30% [1],[2],[4],[5],[29] 12.20% [6],[7],[9],[10],[30]
Investments owned, fair value $ 62,073 [29] $ 60,947 [30]
Non-Control/Non-Affiliate investments | Preferred Equity | Leisure, Amusement, Motion Pictures, and Entertainment    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 9.90% [1],[2],[4],[5],[29] 4.10% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Preferred Equity | Oil and Gas    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 9.90% [1],[2],[4],[5],[29] 7.20% [6],[7],[9],[10],[30]
Investments owned, fair value [29] $ 66,065  
Non-Control/Non-Affiliate investments | Preferred Equity | Printing and Publishing    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[29] 0.00% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Common Equity/ Equivalents    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 31.00% [1],[2],[4],[5],[29] 10.90% [6],[7],[9],[10],[30]
Investments owned, fair value $ 207,495 [29] $ 54,268 [30]
Non-Control/Non-Affiliate investments | Common Equity/ Equivalents | Aerospace and Defense    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.50% [1],[2],[4],[5],[29] 0.70% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Common Equity/ Equivalents | Diversified/Conglomerate Manufacturing    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[29] 0.00% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Common Equity/ Equivalents | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[29] 0.00% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Common Equity/ Equivalents | Cargo Transport    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[29] 0.00% [6],[7],[9],[10],[30]
Non-Control/Non-Affiliate investments | Common Equity/ Equivalents | Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 30.50% [1],[2],[4],[5],[29] 10.20% [6],[7],[9],[10],[30]
Affiliate investments    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 48.60% [1],[2],[4],[5],[14] 66.10% [6],[7],[9],[10],[18]
Investments owned, fair value $ 324,676 [14] $ 330,388 [18]
Affiliate investments | Secured First Lien Debt    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 29.40% [1],[2],[4],[5],[14] 42.70% [6],[7],[9],[10],[18]
Investments owned, fair value $ 195,704 [14] $ 213,240 [18]
Affiliate investments | Secured First Lien Debt | Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 10.60% [1],[2],[4],[5],[14] 16.20% [6],[7],[9],[10],[18]
Investments owned, fair value $ 70,560 [14] $ 80,883 [18]
Affiliate investments | Secured First Lien Debt | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 5.70% [1],[2],[4],[5],[14] 7.60% [6],[7],[9],[10],[18]
Affiliate investments | Secured First Lien Debt | Leisure, Amusement, Motion Pictures, and Entertainment    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 3.00% [1],[2],[4],[5],[14] 4.50% [6],[7],[9],[10],[18]
Investments owned, fair value $ 20,120 $ 22,620 [18]
Affiliate investments | Secured First Lien Debt | Electronics    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 7.20% [1],[2],[4],[5],[14] 9.90% [6],[7],[9],[10],[18]
Investments owned, fair value $ 48,082 $ 49,152 [18]
Affiliate investments | Secured First Lien Debt | Mining, Steel, Iron and Non-Precious Metals    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 1.60% [14] 3.00% [6],[7],[9],[10],[18]
Affiliate investments | Secured First Lien Debt | Telecommunications    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 1.30% [1],[2],[4],[5],[14] 1.50% [6],[7],[9],[10],[18]
Investments owned, fair value $ 7,942 [14] $ 7,585 [18]
Affiliate investments | Secured Second Lien Debt    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.30% [14] 2.10% [6],[7],[9],[10],[18]
Investments owned, fair value $ 1,800 [14] $ 10,616 [18]
Affiliate investments | Secured Second Lien Debt | Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.30% [14] 2.10% [6],[7],[9],[10],[18]
Investments owned, fair value $ 1,800 [14] $ 10,616
Affiliate investments | Preferred Equity    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 18.20% [1],[2],[4],[5],[14] 20.30% [6],[7],[9],[10],[18]
Investments owned, fair value $ 122,167 [14] $ 101,557 [18]
Affiliate investments | Preferred Equity | Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.70% [1],[2],[4],[5],[14] 0.20% [6],[7],[9],[10],[18]
Affiliate investments | Preferred Equity | Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 6.60% [1],[2],[4],[5],[14] 4.30% [6],[7],[9],[10],[18]
Investments owned, fair value $ 44,320 [14] $ 21,331 [18]
Affiliate investments | Preferred Equity | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 4.40% [1],[2],[4],[5],[14] 4.70% [6],[7],[9],[10],[18]
Affiliate investments | Preferred Equity | Leisure, Amusement, Motion Pictures, and Entertainment    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.30% [1],[2],[4],[5],[14] 1.40% [6],[7],[9],[10],[18]
Affiliate investments | Preferred Equity | Electronics    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 2.20% [1],[2],[4],[5],[14] 4.50% [6],[7],[9],[10],[18]
Affiliate investments | Preferred Equity | Mining, Steel, Iron and Non-Precious Metals    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 4.00% [1],[2],[4],[5],[14] 5.20% [6],[7],[9],[10],[18]
Affiliate investments | Preferred Equity | Telecommunications    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[14] 0.00% [6],[7],[9],[10],[18]
Affiliate investments | Common Equity/ Equivalents    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.70% [1],[2],[4],[5],[14] 1.00% [6],[7],[9],[10],[18]
Investments owned, fair value $ 5,005 [14] $ 4,975 [18]
Affiliate investments | Common Equity/ Equivalents | Diversified/Conglomerate Services    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets [1],[2],[4],[5],[14] 0.70%  
Affiliate investments | Common Equity/ Equivalents | Telecommunications    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[14] 0.00% [6],[7],[9],[10],[18]
Affiliate investments | Common Equity/ Equivalents | Finance    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets [6],[7],[9],[10],[18]   1.00%
Control investments    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.10% [1],[2],[4],[5],[31] 0.10% [6],[7],[9],[10],[32]
Investments owned, fair value $ 613 [31] $ 343 [32]
Control investments | Secured First Lien Debt    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.10% [1],[2],[4],[5],[31] 0.10% [6],[7],[9],[10],[32]
Investments owned, fair value $ 613 [31] $ 343 [32]
Control investments | Secured First Lien Debt | Diversified/Conglomerate Manufacturing    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.10% [1],[2],[4],[5],[31] 0.10% [6],[7],[9],[10],[32]
Control investments | Preferred Equity    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[31] 0.00% [6],[7],[9],[10],[32]
Investments owned, fair value $ 0 [31] $ 0 [32]
Control investments | Preferred Equity | Diversified/Conglomerate Manufacturing    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.00% [1],[2],[4],[5],[31] 0.00% [6],[7],[9],[10],[32]
[1] 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 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 March 31, 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 2.1% of total investments, at fair value, as of March 31, 2026.
[2] Category percentages represent the fair value of each category and subcategory as a percentage of net assets as of March 31, 2026.
[3] 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.
[4] Unless indicated otherwise, all cash interest rates are indexed to 30-day Secured Overnight Financing Rate ("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.
[5] 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.
[6] Category percentages represent the fair value of each category and subcategory as a percentage of net assets as of March 31, 2025.
[7] Certain of the securities listed are issued by affiliate(s) of the indicated portfolio company. The majority of the securities listed, totaling $764.7 million 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, 2025, our investments in Pyrotek and Gladstone Alternative are considered non-qualifying assets under Section 55 of the 1940 Act. Such non-qualifying assets represent 3.6% of total investments, at fair value, as of March 31, 2025.
[8] Cumulative gross unrealized appreciation for federal income tax purposes is $183.3 million; cumulative gross unrealized depreciation for federal income tax purposes is $144.9 million. Cumulative net unrealized appreciation is $38.5 million, based on a tax cost of $940.9 million.
[9] Unless indicated otherwise, all cash interest rates are indexed to 30-day SOFR, which was 4.3% as of March 31, 2025. 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 reference rate plus a spread. Due dates represent the contractual maturity date.
[10] Unless indicated otherwise, all of our investments are valued using Level 3 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.
[11] 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.
[12] Security is non-income producing.
[13] 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.
[14] 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.
[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] Security is non-income producing.
[17] 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.
[18] 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.
[19] Debt security is on non-accrual status.
[20] Debt security is on non-accrual status.
[21] The portfolio company changed its name from Ricardo Defense, Inc. to Detroit Defense, Inc. during the year ended March 31, 2026.
[22] Fair value was based on internal yield analysis or on estimates of value submitted by a third-party valuation firm. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[23] 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.
[24] 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.
[25] Fair value was based on net asset value provided by the underlying fund as a practical expedient.
[26] Fair value was based on net asset value, provided by the underlying fund, as a practical expedient.
[27] This portfolio company is headquartered in Ontario, Canada.
[28] This portfolio company is headquartered in Ontario, Canada.
[29] Non-Control/Non-Affiliate investments, as defined by the 1940 Act, are those that are neither Control nor Affiliate investments and in which we own less than 5.0% of the issued and outstanding voting securities.
[30] Non-Control/Non-Affiliate investments, as defined by the 1940 Act, are those that are neither Control nor Affiliate investments and in which we own less than 5.0% of the issued and outstanding voting securities.
[31] 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.
[32] 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.