Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details)

v3.22.4
INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Aug. 31, 2012
New investments, repayments and settlements:                      
Cost $ 722,380   $ 722,380   $ 722,380     $ 669,248 [1]      
Fair Value 760,463   760,463   760,463     714,396 [1]      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Common Stock Warrants                      
New investments, repayments and settlements:                      
Cost [2],[3],[4]               0      
Fair Value [2],[3],[4]               921      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit                      
New investments, repayments and settlements:                      
Cost 2,800 [5],[6]   2,800 [5],[6]   2,800 [5],[6]     2,800 [3],[4],[7]      
Fair Value 2,800 [5],[6]   2,800 [5],[6]   2,800 [5],[6]     2,800 [3],[4],[7]      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost [2],[3],[4]               4,722      
Fair Value [2],[3],[4]               14,746      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost [3],[4],[7]               14,000      
Fair Value [3],[4],[7]               14,000      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(L) – Common Stock Warrants                      
New investments, repayments and settlements:                      
Cost [5],[6],[8],[9] 0   0   0            
Fair Value [5],[6],[8],[9] 0   0   0            
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(L) – Term Debt 2                      
New investments, repayments and settlements:                      
Cost [5],[6] 14,000   14,000   14,000            
Fair Value [5],[6] 14,000   14,000   14,000            
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.– Preferred Stock                      
New investments, repayments and settlements:                      
Cost [5],[6],[9] 4,722   4,722   4,722            
Fair Value [5],[6],[9] 2,653   2,653   2,653            
Investment, Identifier [Axis]: Bassett Creek Services, Inc.                      
New investments, repayments and settlements:                      
Realized gain on preferred equity   $ 4,700                  
Investment, Identifier [Axis]: Bassett Creek Services, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost [2],[3]               4,900      
Fair Value [2],[3]               17,150      
Investment, Identifier [Axis]: Bassett Creek Services, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost [3]               48,000      
Fair Value [3]               48,000      
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 6,653 [5],[9]   6,653 [5],[9]   6,653 [5],[9]     6,653 [2],[3]      
Fair Value 35,255 [5],[9]   35,255 [5],[9]   35,255 [5],[9]     21,485 [2],[3]      
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 1                      
New investments, repayments and settlements:                      
Cost 17,700 [5]   17,700 [5]   17,700 [5]     17,700 [3]      
Fair Value 17,700 [5]   17,700 [5]   17,700 [5]     17,700 [3]      
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 2                      
New investments, repayments and settlements:                      
Cost 6,850 [5]   6,850 [5]   6,850 [5]     6,850 [3]      
Fair Value 6,850 [5]   6,850 [5]   6,850 [5]     6,850 [3]      
Investment, Identifier [Axis]: Counsel Press, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 6,995 [5],[9]   6,995 [5],[9]   6,995 [5],[9]     6,995 [2],[3]      
Fair Value 27,539 [5],[9]   27,539 [5],[9]   27,539 [5],[9]     25,374 [2],[3]      
Investment, Identifier [Axis]: Counsel Press, Inc. – Term Debt 1                      
New investments, repayments and settlements:                      
Cost 21,100 [5]   21,100 [5]   21,100 [5]     21,100 [3]      
Fair Value 21,100 [5]   21,100 [5]   21,100 [5]     21,100 [3]      
Investment, Identifier [Axis]: Counsel Press, Inc. – Term Debt 2                      
New investments, repayments and settlements:                      
Cost 6,400 [5]   6,400 [5]   6,400 [5]     6,400 [3]      
Fair Value 6,400 [5]   6,400 [5]   6,400 [5]     6,400 [3]      
Investment, Identifier [Axis]: Country Club Enterprises, LLC - Guaranty                      
New investments, repayments and settlements:                      
Cost [10]               0      
Fair Value [10]               0      
Investment, Identifier [Axis]: Country Club Enterprises, LLC – Term Debt                      
New investments, repayments and settlements:                      
Cost [11]               1,500      
Fair Value [11]               1,498      
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc - Preferred Equity                      
New investments, repayments and settlements:                      
Cost [5],[9] 21,000   21,000   21,000            
Fair Value [5],[9] 24,877   24,877   24,877            
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc – Term Debt                      
New investments, repayments and settlements:                      
Cost [5] 38,250   38,250   38,250            
Fair Value [5] 38,250   38,250   38,250            
Investment, Identifier [Axis]: Diligent Delivery Systems – Common Stock Warrants                      
New investments, repayments and settlements:                      
Cost 500 [5],[9]   500 [5],[9]   500 [5],[9]     500 [2],[3]      
Fair Value 2,249 [5],[9]   2,249 [5],[9]   2,249 [5],[9]     1,533 [2],[3]      
Investment, Identifier [Axis]: Diligent Delivery Systems – Term Debt                      
New investments, repayments and settlements:                      
Cost 13,000 [12]   13,000 [12]   13,000 [12]     12,987 [11]      
Fair Value 13,016 [12]   13,016 [12]   13,016 [12]     13,000 [11]      
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 8,199 [5],[6],[9]   8,199 [5],[6],[9]   8,199 [5],[6],[9]     8,199 [2],[3],[4],[7]      
Fair Value 0 [5],[6],[9]   0 [5],[6],[9]   0 [5],[6],[9]     0 [2],[3],[4],[7]      
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost [4],[11]               9,210      
Fair Value [4],[11]               9,072      
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc.– Term Debt                      
New investments, repayments and settlements:                      
Cost [5],[6],[13] 9,210   9,210   9,210            
Fair Value [5],[6],[13] 3,677   3,677   3,677            
Investment, Identifier [Axis]: Educators Resource, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 8,560 [5],[9]   8,560 [5],[9]   8,560 [5],[9]     8,560 [2],[3]      
Fair Value 17,638 [5],[9]   17,638 [5],[9]   17,638 [5],[9]     19,252 [2],[3]      
Investment, Identifier [Axis]: Educators Resource, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 20,000 [5]   20,000 [5]   20,000 [5]     20,000 [3]      
Fair Value 20,000 [5]   20,000 [5]   20,000 [5]     20,000 [3]      
Investment, Identifier [Axis]: Funko Acquisition Holdings, LLC – Common Units                      
New investments, repayments and settlements:                      
Cost 21 [6],[9],[14]   21 [6],[9],[14]   21 [6],[9],[14]     30 [2],[4],[15],[16]      
Fair Value 31 [6],[9],[14]   31 [6],[9],[14]   31 [6],[9],[14]     74 [2],[4],[15],[16]      
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Common Stock                      
New investments, repayments and settlements:                      
Cost 11,513 [5],[9]   11,513 [5],[9]   11,513 [5],[9]     11,513 [2],[3]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3]      
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 1                      
New investments, repayments and settlements:                      
Cost 6,900 [5]   6,900 [5]   6,900 [5]     6,500 [3]      
Fair Value 5,610 [5]   5,610 [5]   5,610 [5]     6,500 [3]      
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 2                      
New investments, repayments and settlements:                      
Cost 18,796 [5]   18,796 [5]   18,796 [5]     18,796 [3]      
Fair Value 15,281 [5]   15,281 [5]   15,281 [5]     18,796 [3]      
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc.                      
New investments, repayments and settlements:                      
Cost                     $ 5,000
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Common Stock                      
New investments, repayments and settlements:                      
Cost 8 [5],[9]   8 [5],[9]   8 [5],[9]     8 [2],[3]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3]      
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 9,583 [5],[9]   9,583 [5],[9]   9,583 [5],[9]     9,583 [2],[3]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     3,263 [2],[3]      
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost [5] 12,200   12,200   12,200            
Fair Value 12,200 [5]   12,200 [5]   12,200 [5]     13,300 [4],[17]      
Investment, Identifier [Axis]: Gladstone SOG Investments, Inc. - Common Stock(                      
New investments, repayments and settlements:                      
Cost [5],[9] 620   620   620            
Fair Value [5],[9] 713   713   713            
Investment, Identifier [Axis]: Horizon Facilities Services, Inc.                      
New investments, repayments and settlements:                      
Realized gain on preferred equity         12,300            
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 0 [5],[9]   0 [5],[9]   0 [5],[9]     10,080 [2],[3]      
Fair Value 13,188 [5],[9]   13,188 [5],[9]   13,188 [5],[9]     17,807 [2],[3]      
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 57,700 [5]   57,700 [5]   57,700 [5]     27,700 [3]      
Fair Value 57,700 [5]   57,700 [5]   57,700 [5]     27,700 [3]      
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 6,749 [5],[9]   6,749 [5],[9]   6,749 [5],[9]     6,749 [2],[3],[7]      
Fair Value 13,131 [5],[9]   13,131 [5],[9]   13,131 [5],[9]     16,405 [2],[3],[7]      
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 22,000 [5]   22,000 [5]   22,000 [5]     22,000 [3],[7]      
Fair Value 22,000 [5]   22,000 [5]   22,000 [5]     22,000 [3],[7]      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Guaranty                      
New investments, repayments and settlements:                      
Cost [7],[10]               0      
Fair Value [7],[10]               0      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 1                      
New investments, repayments and settlements:                      
Cost 16,500 [5],[13]   16,500 [5],[13]   16,500 [5],[13]     16,500 [3],[7],[18]      
Fair Value 10,556 [5],[13]   10,556 [5],[13]   10,556 [5],[13]     15,023 [3],[7],[18]      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 2                      
New investments, repayments and settlements:                      
Cost [3],[7],[18]               26,000      
Fair Value [3],[7],[18]               23,672      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 3                      
New investments, repayments and settlements:                      
Cost [3],[7],[18]               2,438      
Fair Value [3],[7],[18]               2,219      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Line of Credit                      
New investments, repayments and settlements:                      
Cost [5],[13] 5,000   5,000   5,000            
Fair Value [5],[13] 3,199   3,199   3,199            
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 2                      
New investments, repayments and settlements:                      
Cost [5],[13] 26,000   26,000   26,000            
Fair Value [5],[13] 16,634   16,634   16,634            
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 3                      
New investments, repayments and settlements:                      
Cost [5],[13] 2,438   2,438   2,438            
Fair Value [5],[13] 1,560   1,560   1,560            
Investment, Identifier [Axis]: J.R. Hobbs Co. – Atlanta, LLC – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 10,920 [5],[9]   10,920 [5],[9]   10,920 [5],[9]     10,920 [2],[3],[7]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3],[7]      
Investment, Identifier [Axis]: Mason West, LLC – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 11,206 [5],[9]   11,206 [5],[9]   11,206 [5],[9]     11,206 [2],[3]      
Fair Value 10,896 [5],[9]   10,896 [5],[9]   10,896 [5],[9]     7,553 [2],[3]      
Investment, Identifier [Axis]: Mason West, LLC – Term Debt                      
New investments, repayments and settlements:                      
Cost 25,250 [5]   25,250 [5]   25,250 [5]     25,250 [3]      
Fair Value 25,250 [5]   25,250 [5]   25,250 [5]     25,250 [3]      
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Line of Credit                      
New investments, repayments and settlements:                      
Cost 2,000 [5]   2,000 [5]   2,000 [5]     0 [3]      
Fair Value 2,000 [5]   2,000 [5]   2,000 [5]     0 [3]      
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 6,600 [5],[9]   6,600 [5],[9]   6,600 [5],[9]     6,600 [2],[3]      
Fair Value 14,858 [5],[9]   14,858 [5],[9]   14,858 [5],[9]     10,223 [2],[3]      
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 42,450 [5]   42,450 [5]   42,450 [5]     27,700 [3]      
Fair Value 42,450 [5]   42,450 [5]   42,450 [5]     27,700 [3]      
Investment, Identifier [Axis]: Nth Degree Investment Group, LLC – Common Stock                      
New investments, repayments and settlements:                      
Cost 1,219 [5],[9]   1,219 [5],[9]   1,219 [5],[9]     1,219 [2],[3]      
Fair Value 12,036 [5],[9]   12,036 [5],[9]   12,036 [5],[9]     511 [2],[3]      
Investment, Identifier [Axis]: Old World Christmas, Inc.                      
New investments, repayments and settlements:                      
Realized gain on preferred equity 13,400   13,400   13,400            
Investment, Identifier [Axis]: Old World Christmas, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3],[7]      
Fair Value 35,028 [5],[9]   35,028 [5],[9]   35,028 [5],[9]     37,842 [2],[3],[7]      
Investment, Identifier [Axis]: Old World Christmas, Inc. – Secured First Lien Term Loan                      
New investments, repayments and settlements:                      
Cost 40,500 [5]   40,500 [5]   40,500 [5]     25,000 [3],[7]      
Fair Value 40,500 [5]   40,500 [5]   40,500 [5]     25,000 [3],[7]      
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost [2],[3],[7]               19,730      
Fair Value [2],[3],[7]               0      
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock(                      
New investments, repayments and settlements:                      
Cost [5],[9] 19,730   19,730   19,730            
Fair Value [5],[9] 0   0   0            
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 26,618 [5]   26,618 [5]   26,618 [5]     26,618 [3]      
Fair Value 26,618 [5]   26,618 [5]   26,618 [5]     26,618 [3]      
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit                      
New investments, repayments and settlements:                      
Cost [12] 2,550   2,550   2,550            
Fair Value [12] 2,423   2,423   2,423            
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit,                      
New investments, repayments and settlements:                      
Cost [11]               2,000      
Fair Value [11]               1,920      
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Common Stock                      
New investments, repayments and settlements:                      
Cost 1,830 [5],[9]   1,830 [5],[9]   1,830 [5],[9]     1,452 [2],[3]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3]      
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 3,200 [12]   3,200 [12]   3,200 [12]     3,200 [11]      
Fair Value 3,040 [12]   3,040 [12]   3,040 [12]     3,072 [11]      
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Common Stock                      
New investments, repayments and settlements:                      
Cost 222 [5],[9]   222 [5],[9]   222 [5],[9]     222 [2],[3],[16]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3],[16]      
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 4,643 [5],[9]   4,643 [5],[9]   4,643 [5],[9]     4,643 [2],[3]      
Fair Value 2,465 [5],[9]   2,465 [5],[9]   2,465 [5],[9]     0 [2],[3]      
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 1                      
New investments, repayments and settlements:                      
Cost 3,128 [5]   3,128 [5]   3,128 [5]     3,128 [11],[18]      
Fair Value 3,128 [5]   3,128 [5]   3,128 [5]     2,909 [11],[18]      
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 2                      
New investments, repayments and settlements:                      
Cost 12,516 [5]   12,516 [5]   12,516 [5]     11,736 [11],[18]      
Fair Value 12,516 [5]   12,516 [5]   12,516 [5]     10,914 [11],[18]      
Investment, Identifier [Axis]: Schylling, Inc. – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 4,000 [5],[9]   4,000 [5],[9]   4,000 [5],[9]     4,000 [2],[3]      
Fair Value 19,452 [5],[9]   19,452 [5],[9]   19,452 [5],[9]     17,820 [2],[3]      
Investment, Identifier [Axis]: Schylling, Inc. – Term Debt                      
New investments, repayments and settlements:                      
Cost 27,981 [5]   27,981 [5]   27,981 [5]     27,981 [3]      
Fair Value 27,981 [5]   27,981 [5]   27,981 [5]     27,981 [3]      
Investment, Identifier [Axis]: The Maids International, LLC – Preferred Stock                      
New investments, repayments and settlements:                      
Cost 6,640 [5],[9]   6,640 [5],[9]   6,640 [5],[9]     6,640 [2],[3],[7]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     2,679 [2],[3],[7]      
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt                      
New investments, repayments and settlements:                      
Cost [3],[7]               28,560      
Fair Value [3],[7]               28,560      
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt                      
New investments, repayments and settlements:                      
Cost [5] 28,560   28,560   28,560            
Fair Value [5] 28,560   28,560   28,560            
Investment, Identifier [Axis]: The Mountain Corporation 1                      
New investments, repayments and settlements:                      
Cost [3],[7],[18]               3,400      
Fair Value [3],[7],[18]               3,400      
Investment, Identifier [Axis]: The Mountain Corporation 2                      
New investments, repayments and settlements:                      
Cost [3],[7],[18]               800      
Fair Value [3],[7],[18]               800      
Investment, Identifier [Axis]: The Mountain Corporation – Common Stock                      
New investments, repayments and settlements:                      
Cost 1 [5],[9]   1 [5],[9]   1 [5],[9]     1 [2],[3]      
Fair Value 0 [5],[9]   0 [5],[9]   0 [5],[9]     0 [2],[3]      
Investment, Identifier [Axis]: The Mountain Corporation – Delayed Draw Term Debt                      
New investments, repayments and settlements:                      
Cost [3],[7],[18]               1,500      
Fair Value [3],[7],[18]               118      
Investment, Identifier [Axis]: The Mountain Corporation – Line of Credit 1                      
New investments, repayments and settlements:                      
Cost [5],[13] 3,400   3,400   3,400            
Fair Value [5],[13] 2,411   2,411   2,411            
Investment, Identifier [Axis]: The Mountain Corporation – Line of Credit 2                      
New investments, repayments and settlements:                      
Cost [5],[13] 900   900   900            
Fair Value [5],[13] 0   0   0            
Investment, Identifier [Axis]: The Mountain Corporation – Preferred Stock                      
New investments, repayments and settlements:                      
Cost [2],[3]               6,899      
Fair Value [2],[3]               0      
Investment, Identifier [Axis]: The Mountain Corporation – Preferred Stock(                      
New investments, repayments and settlements:                      
Cost [5],[9] 6,899   6,899   6,899            
Fair Value [5],[9] 0   0   0            
Investment, Identifier [Axis]: The Mountain Corporation – Term Debt                      
New investments, repayments and settlements:                      
Cost [3],[7],[18]               11,700      
Fair Value [3],[7],[18]               923      
Investment, Identifier [Axis]: The Mountain Corporation – Term Debt                      
New investments, repayments and settlements:                      
Cost [5],[13] 3,200   3,200   3,200            
Fair Value [5],[13] 0   0   0            
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd. - Preferred Stock                      
New investments, repayments and settlements:                      
Cost 6,000 [5],[9]   6,000 [5],[9]   6,000 [5],[9]     6,000 [2],[3],[7]      
Fair Value 4,794 [5],[9]   4,794 [5],[9]   4,794 [5],[9]     6,000 [2],[3],[7]      
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 2                      
New investments, repayments and settlements:                      
Cost [3],[7]               18,250      
Fair Value [3],[7]               18,250      
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 1                      
New investments, repayments and settlements:                      
Cost [3],[7]               0      
Fair Value [3],[7]               0      
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 2                      
New investments, repayments and settlements:                      
Cost [5] 18,250   18,250   18,250            
Fair Value [5] 18,250   18,250   18,250            
Total                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance 760,432   760,432 $ 700,658 760,432 $ 700,658 $ 737,877 714,322 $ 736,425 $ 633,734  
New investments, repayments and settlements:                      
Issuances / originations     31,463 37,005 133,518 84,565          
Settlements / repayments     (2,300) (32,838) (55,396) (46,898)          
Sales     (13,372) (41,768) (35,298) (49,394)          
Transfers     0 0 0 0          
Ending balance 760,432   760,432 700,658 760,432 700,658          
Total | Debt and Equity Securities, Realized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     3,372 21,939 10,318 23,725          
Total | Debt and Equity Securities, Unrealized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     (6,609) 5,320 (4,783) 80,919          
Reversal of previously recorded (appreciation) depreciation upon realization     10,001 (25,425) (2,249) (25,993)          
Secured First Lien Debt                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance 447,491   447,491 433,834 447,491 433,834 420,907 425,087 431,413 368,688  
New investments, repayments and settlements:                      
Issuances / originations     29,900 37,000 106,950 65,450          
Settlements / repayments     (800) (32,838) (48,800) (46,898)          
Sales     0 0 0 0          
Transfers     0 0 (14,418) 45,043          
Ending balance 447,491   447,491 433,834 447,491 433,834          
Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     0 0 0 0          
Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     (2,516) (1,741) (21,328) 1,491          
Reversal of previously recorded (appreciation) depreciation upon realization     0 0 0 60          
Secured First Lien Debt | Investment, Identifier [Axis]: PSI Molded Plastics, Inc.                      
New investments, repayments and settlements:                      
Cost 26,600   26,600   26,600            
Fair Value 26,600   26,600   26,600            
Secured Second Lien Debt                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance 76,169   76,169 68,294 76,169 68,294 76,751 67,958 68,489 102,897  
New investments, repayments and settlements:                      
Issuances / originations     1,183 5 5,188 6,515          
Settlements / repayments     (1,500) 0 (6,596) 0          
Sales     0 0 0 0          
Transfers     0 0 14,418 (45,043)          
Ending balance 76,169   76,169 68,294 76,169 68,294          
Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     (10,000) 0 (10,000) 0          
Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     (266) (200) (4,800) 3,925          
Reversal of previously recorded (appreciation) depreciation upon realization     10,001 0 10,001 0          
Secured Second Lien Debt | Investment, Identifier [Axis]: D.P.M.S., Inc.                      
New investments, repayments and settlements:                      
Cost       12,300   12,300          
Fair Value       7,300   7,300          
Secured Second Lien Debt | Investment, Identifier [Axis]: Ginsey Home Solutions, Inc.                      
New investments, repayments and settlements:                      
Cost 12,200   12,200   12,200            
Fair Value 12,200   12,200   12,200            
Secured Second Lien Debt | Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC                      
New investments, repayments and settlements:                      
Cost       52,500   52,500          
Fair Value       52,400   52,400          
Preferred Equity                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance 221,774   221,774 196,104 221,774 196,104 229,430 217,599 228,931 159,478  
New investments, repayments and settlements:                      
Issuances / originations     0 0 21,000 12,600          
Settlements / repayments     0 0 0 0          
Sales     (13,372) (41,768) (35,298) (49,394)          
Transfers     0 0 0 (16,034)          
Ending balance 221,774   221,774 196,104 221,774 196,104          
Preferred Equity | Debt and Equity Securities, Realized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     13,372 21,939 20,318 23,725          
Preferred Equity | Debt and Equity Securities, Unrealized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     (7,656) 12,427 10,405 91,782          
Reversal of previously recorded (appreciation) depreciation upon realization     0 (25,425) (12,250) (26,053)          
Preferred Equity | Investment, Identifier [Axis]: Galaxy Technologies, Inc.                      
New investments, repayments and settlements:                      
Cost       11,500   11,500          
Fair Value       16,000   16,000          
Preferred Equity | Investment, Identifier [Axis]: SOG Specialty Knives & Tools, LLC                      
New investments, repayments and settlements:                      
Cost       600   600          
Fair Value       0   0          
Common Equity/ Equivalents                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance 14,998   14,998 2,426 14,998 2,426 $ 10,789 $ 3,678 $ 7,592 $ 2,671  
New investments, repayments and settlements:                      
Issuances / originations     380 0 380 0          
Settlements / repayments     0 0 0 0          
Sales     0 0 0 0          
Transfers     0 0 0 16,034          
Ending balance $ 14,998   14,998 2,426 14,998 2,426          
Common Equity/ Equivalents | Debt and Equity Securities, Realized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     0 0 0 0          
Common Equity/ Equivalents | Debt and Equity Securities, Unrealized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)     3,829 (5,166) 10,940 (16,279)          
Reversal of previously recorded (appreciation) depreciation upon realization     $ 0 $ 0 $ 0 $ 0          
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $140.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $97.1 million. Cumulative net unrealized appreciation is $43.8 million, based on a tax cost of $670.6 million.
[2] .
[3] 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.
[4] One of our affiliated funds, Gladstone Capital Corporation, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission.
[5] 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.
[6] One of our affiliated funds, Gladstone Capital Corporation, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission.
[7] 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.
[8] 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.
[9] non-income producing.
[10] Refer to Note 10—Commitments and Contingencies in the accompanying Notes to Consolidated Financial Statements for additional information regarding this guaranty.
[11] Fair value was based on internal yield analysis or on estimates of value submitted by ICE Data Pricing and Reference Data, LLC. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[12] Fair value was based on internal yield analysis or on estimates of value submitted by ICE Data Pricing and Reference Data, LLC. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[13] Debt security is on non-accrual status.
[14] Our investment in Funko was valued using Level 2 inputs within the ASC 820 fair value hierarchy. Our common units in Funko are convertible into class A common stock in Funko, Inc. upon meeting certain requirements. Fair value was based on the closing market price of shares of Funko, Inc. as of the reporting date, less a discount for lack of marketability. Funko, Inc. is traded on the Nasdaq Global Select Market under the trading symbol “FNKO.” Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[15] Our investment in Funko was valued using Level 2 inputs within the ASC 820 fair value hierarchy. Our common units in Funko are convertible into class A common stock in Funko, Inc. upon meeting certain requirements. Fair value was based on the closing market price of shares of Funko, Inc. as of the reporting date, less a discount for lack of marketability. Funko, Inc. is traded on the Nasdaq Global Select Market under the trading symbol “FNKO.” Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[16] 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.
[17] $5.1 million of the debt security was participated to a third-party, but is accounted for as collateral for a secured borrowing under accounting principles generally accepted in the U.S. and presented as Secured borrowing on our accompanying Consolidated Statements of Assets and Liabilities as of March 31, 2022.
[18] Debt security is on non-accrual status.