Quarterly report pursuant to Section 13 or 15(d)

FINANCIAL HIGHLIGHTS (Details)

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FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Investment Company, Financial Highlights [Roll Forward]              
Net asset value at beginning of period (in USD per share) $ 9.61 $ 9.39 $ 9.06 $ 9.08 $ 9.39 $ 9.08  
Income from operations              
Net investment income (in USD per share) 0.25   0.26   0.52 0.51  
Net realized and unrealized gain (loss) on investments (in USD per share) 0.25   0.06   0.44 (0.04)  
Net realized and unrealized gain (loss) on other (in USD per share) 0.04   0.01   0.04 0.02  
Total from operations (in USD per share) 0.54   0.33   1.00 0.49  
Distributions to common stockholders from              
Net investment income (in USD per share) (0.25) (0.25) (0.23) (0.21) (0.50) (0.44)  
Return of capital (in USD per share) 0   0   0 0  
Total distributions (in USD per share) (0.25)   (0.23)   (0.50) (0.44)  
Anti-dilutive effect of common stock issuance (in USD per share) 0   0.04   0 0.07  
Total capital share transactions (in USD per share) 0   0.04   0 0.07  
Other, net (in USD per share) 0   (0.01)   0.01 (0.01)  
Net asset value at end of period (in USD per share) 9.90 9.61 9.19 9.06 9.90 9.19  
Per common share market value at beginning of period (in USD per share) 10.70 9.64 9.62 8.49 9.64 8.49  
Per common share market value at end of period (in USD per share) $ 10.73 $ 10.70 $ 9.40 $ 9.62 $ 10.73 $ 9.40  
Total return 2.66%   (0.06%)   16.77% 15.70%  
Common stock outstanding at end of period (in shares) 43,508,897   37,185,569   43,508,897 37,185,569 43,508,897
Statement of Assets and Liabilities Data:              
Net assets at end of period $ 430,791   $ 341,811   $ 430,791 $ 341,811  
Average net assets 424,518   337,720   418,742 332,327  
Senior Securities Data:              
Borrowings under line of credit, at cost 117,200   152,600   117,200 152,600  
Notes payable $ 257,000   $ 200,000   $ 257,000 $ 200,000  
Ratios/Supplemental Data:              
Ratio of net expenses to average net assets – annualized 12.46%   12.94%   11.70% 12.94%  
Ratio of net investment income to average net assets – annualized 10.15%   11.41%   10.85% 11.05%  
Ratio of expenses to average net assets - annualized 15.04%   16.12%   14.81% 15.96%  
Ratio of net investment income (loss) to average net assets – annualized 7.62%   8.30%   7.80% 8.09%  
Series A Preferred Stock              
Senior Securities Data:              
Series A Preferred Stock $ 1,751   $ 0   $ 1,751 $ 0