Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Mar. 31, 2022
Summary of Investment Holdings [Line Items]    
Cost $ 720,630 [1] $ 669,248 [2]
Fair value 753,543 [1] 714,396 [2]
J.R. Hobbs Co. and The Mountain Corporation    
Summary of Investment Holdings [Line Items]    
Cost $ 66,900  
Cost percentage 12.00%  
Fair value $ 31,700  
Fair value percentage 6.20%  
J.R. Hobbs, The Mountain, and SFEG Holdings, Inc.    
Summary of Investment Holdings [Line Items]    
Cost   $ 77,200
Cost percentage   15.10%
Fair value   $ 60,000
Fair value percentage   12.20%
Non-Control/Non-Affiliate investments    
Summary of Investment Holdings [Line Items]    
Investment owned, percent of voting securities   5.00%
Cost $ 429,305 [3] $ 388,773 [4]
Fair value 496,875 [3] 442,124 [4]
Affiliate investments    
Summary of Investment Holdings [Line Items]    
Cost 276,055 [5] 279,855 [6]
Fair value 255,955 [5] $ 271,559 [6]
Affiliate investments | Minimum    
Summary of Investment Holdings [Line Items]    
Investment owned, percent of voting securities   5.00%
Affiliate investments | Maximum    
Summary of Investment Holdings [Line Items]    
Investment owned, percent of voting securities   25.00%
Control investments    
Summary of Investment Holdings [Line Items]    
Investment owned, percent of voting securities   25.00%
Cost 15,270 [7] $ 620 [8]
Fair value $ 713 [7] $ 713 [8]
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.
[2] 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.
[3] 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.
[4] 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.
[5] 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.
[6] 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.
[7] 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.
[8] 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.