Annual report pursuant to Section 13 and 15(d)

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Investment Company, Changes in Net Assets (Details)

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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Investment Company, Changes in Net Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Underdistributed (overdistributed) net investment income    
Investment Company, Changes in Net Assets [Line Items]    
Increase (decrease) due to reclassifications of permanent differences $ 1,301 $ (333)
Accumulated net realized gain in excess of distributions    
Investment Company, Changes in Net Assets [Line Items]    
Increase (decrease) due to reclassifications of permanent differences 263 3,181
Capital in excess of par value    
Investment Company, Changes in Net Assets [Line Items]    
Increase (decrease) due to reclassifications of permanent differences $ (1,564) $ (2,848)