Annual report [Section 13 and 15(d), not S-K Item 405]

REGISTRATION STATEMENT AND COMMON EQUITY OFFERINGS (Details)

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REGISTRATION STATEMENT AND COMMON EQUITY OFFERINGS (Details) - USD ($)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
May 31, 2024
Feb. 28, 2024
Aug. 31, 2022
Sep. 03, 2021
Government Assistance [Line Items]              
Proceeds from issuance of common stock $ 2,029,000 $ 44,508,000 $ 5,492,000        
Registration Statement on Form N-2 (File No. 333-277452)              
Government Assistance [Line Items]              
Securities, aggregate value authorized         $ 450,000,000.0    
Securities, remaining capacity of aggregate value authorized 321,500,000            
Registration Statement on Form N-2 (File No. 333-259302)              
Government Assistance [Line Items]              
Securities, aggregate value authorized             $ 300,000,000.0
Common Stock ATM Program 2024              
Government Assistance [Line Items]              
Sale of stock, aggregate offering price authorized       $ 75,000,000.0      
Remaining capacity of authorized offering price $ 73,000,000.0            
Common Stock ATM Program              
Government Assistance [Line Items]              
Sale of stock, number of shares sold (in shares) 148,714            
Sale of stock, weighted-average gross price per share (in USD per share) $ 13.64            
Consideration received on transaction $ 2,000,000.0            
Sale of stock, weighted-average net price per share after deducting commissions and offering costs (in USD per share) $ 13.48            
Proceeds from issuance of common stock $ 2,000,000.0            
Common Stock ATM Program 2022              
Government Assistance [Line Items]              
Sale of stock, aggregate offering price authorized           $ 50,000,000.0  
Sale of stock, number of shares sold (in shares)   3,097,162 386,482        
Sale of stock, weighted-average gross price per share (in USD per share)   $ 14.37 $ 14.21        
Consideration received on transaction   $ 44,500,000 $ 5,500,000        
Sale of stock, weighted-average net price per share after deducting commissions and offering costs (in USD per share)   $ 14.12 $ 14.01        
Proceeds from issuance of common stock   $ 43,700,000 $ 5,400,000