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, 2024
Mar. 31, 2023
Summary of Investment Holdings [Line Items]    
Cost $ 854,290 [1] $ 720,630 [2]
Fair value 920,504 [1] 753,543 [2]
Edge Adhesives and J.R. Hobbs    
Summary of Investment Holdings [Line Items]    
Cost $ 59,100  
Cost percentage 9.00%  
Fair value $ 29,700  
Fair value percentage 4.80%  
Edge Adhesives Holdings, Inc., J.R. Hobbs Co. and The Mountain    
Summary of Investment Holdings [Line Items]    
Cost   $ 66,900
Cost percentage   12.00%
Fair value   $ 31,700
Fair value percentage   6.20%
Non-Control/Non-Affiliate investments    
Summary of Investment Holdings [Line Items]    
Investment owned, percent of voting securities 5.00%  
Cost $ 544,799 [3] $ 429,305 [4]
Fair value 622,233 [3] 496,875 [4]
Affiliate investments    
Summary of Investment Holdings [Line Items]    
Cost 292,082 [5] 276,055 [6]
Fair value $ 295,366 [5] 255,955 [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 $ 17,409 [7] 15,270 [8]
Fair value $ 2,905 [7] $ 713 [8]
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $180.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $115.8 million. Cumulative net unrealized appreciation is $64.7 million, based on a tax cost of $855.8 million.
[2] 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.
[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.