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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 18, 2021
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
investment
Accounting Policies [Abstract]            
FDIC Insured amount   $ 7,100,000   $ 7,100,000   $ 8,900,000
FDIC uninsured amount   $ 21,700,000   $ 21,700,000   $ 20,300,000
Concentration Risk [Line Items]            
Non-cash interest income percent   3.40% 3.60% 3.20% 3.70%  
Number of PIK investments | investment   4   4   3
Non-cash PIK interest income percent   3.60% 5.20% 3.80% 4.20%  
Interest or penalties expense   $ 0 $ 0 $ 0 $ 0  
Restricted Stock | 2010 Plan            
Concentration Risk [Line Items]            
Right to grant period 10 years          
Percentage of Total Portfolio at Fair Value | Credit risk | Investment Owned, Non-accrual Status            
Concentration Risk [Line Items]            
Percent of total investment portfolio's fair value       2.00%   0.30%
Percentage of Total Portfolio at Cost | Credit risk | Investment Owned, Non-accrual Status            
Concentration Risk [Line Items]            
Percent of total investment portfolio's fair value       2.90%   1.30%