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RELATED PARTY ARRANGEMENTS - Investment Income Incentive Fee (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
RELATED PARTY ARRANGEMENTS        
Incentive fees   $ 3,782,151 $ 3,043,470 $ 2,527,813
Incentive fee payable current   $ 2,083,928 1,459,942  
Stellus Capital        
RELATED PARTY ARRANGEMENTS        
Pre-Incentive fee net investment income, quarter hurdle rate 2.00% 2.00%    
Pre-Incentive fee net investment income, annual hurdle rate 8.00%      
Incentive fee paid to investment advisor   $ 0    
Cumulative pre-incentive fee net rate of return   20.00%    
Incentive fees   $ 3,782,151 3,043,470 $ 2,527,813
Incentive fee payable   2,464,408 1,749,130  
Incentive fee payable current   2,083,928 1,459,942  
Stellus Capital | Payment in Kind (PIK)        
RELATED PARTY ARRANGEMENTS        
Incentive fee payable   $ 380,480 $ 289,188  
Stellus Capital | Scenario, Hurdle Rate Less Than 2.5%        
RELATED PARTY ARRANGEMENTS        
Pre-Incentive fee net investment income, quarter hurdle rate   2.50%    
Pre-Incentive fee net investment income, annual hurdle rate   10.00%    
Cumulative pre-incentive fee net rate of return   100.00%    
Stellus Capital | Scenario, Hurdle Rate Greater Than Than 2.5%        
RELATED PARTY ARRANGEMENTS        
Pre-Incentive fee net investment income, quarter hurdle rate   2.50%    
Pre-Incentive fee net investment income, annual hurdle rate   10.00%    
Cumulative pre-incentive fee net rate of return   20.00%