Quarterly report pursuant to Section 13 or 15(d)

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details)

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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
 [1]
Sep. 30, 2021
Jun. 30, 2021
 [1]
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Equity [Abstract]                
Investment company, cash distributions paid to common stockholders from ordinary income 61.10%       61.10%     71.30%
Investment company, cash distributions paid to common stockholders from capital gains 38.90%       38.90%     28.70%
Cash distributions to common stockholders         $ 18,900 $ 16,900    
Distributions to common stockholders from ordinary income $ 4,678 [1] $ 3,188 $ 5,490 [1] $ 6,593     $ 13,900  
Distributions to common stockholders from net realized gains 2,797 [1] $ 8,268 2,482 [1] $ 2,372     $ 15,700  
Investment company, net adjustments for tax difference to capital distribution $ 400   $ 2,100   $ 1,300 $ 2,700    
Investment company, deemed distribution approach, notice period             60 days  
[1] o Note 9 — Distributions to Common Stockholders in the accompanying Notes to Consolidated Financial Statements for additional information.