Quarterly report [Sections 13 or 15(d)]

FINANCIAL HIGHLIGHTS (Details)

v3.26.1
FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Per Common Share Data:              
Net asset value at beginning of period (in USD per share)   $ 21.34   $ 21.18 $ 21.34 $ 21.18  
Income from operations              
Net investment income, basic (in USD per share) $ 0.52   $ 0.50   1.02 1.00  
Net realized and unrealized gain (loss) on investments (in USD per share)         0.03 0.61  
Net realized and unrealized gain (loss) on other (in USD per share)         (0.08) (0.01)  
Preferred stock dividends (in USD per share)         (0.05) 0  
Total from operations (in USD per share)         0.92 1.60  
Distributions to common stockholders from              
Net investment income (in USD per share) (0.45) [1] (0.42) [1] (0.50) [1] (0.50) [1] (0.87) (1.00)  
Realized gains (in USD per share) (0.00) [1] (0.03) [1] (0.00) [1] (0.40) [1] (0.03) (0.40)  
Total distributions (in dollar per share)         (0.90) (1.40)  
Anti-dilutive effect of common stock issuance              
Anti-dilutive effect of common stock issuance (in USD per share)         0 0.02  
Total capital share transactions (in USD per share)         0 0.02  
Other, net (in USD per share)         0 0.01  
Net asset value at end of period (in USD per share) 21.36   21.41   21.36 21.41  
Per common share market value at beginning of period (in USD per share)   $ 21.87   $ 24.05 21.87 24.05  
Per common share market value at end of period (in USD per share) $ 17.35   $ 27.46   $ 17.35 $ 27.46  
Total return         (16.93%) 20.06%  
Common stock outstanding at end of period (in shares) 22,593,069   22,329,852   22,593,069 22,329,852 22,593,069
Statement of Assets and Liabilities Data:              
Net assets at end of period $ 482,614   $ 478,059   $ 482,614 $ 478,059 $ 482,035
Average net assets         481,504 480,458  
Senior Securities Data:              
Borrowings under line of credit, at cost 199,800   25,100   199,800 25,100  
Preferred Stock 39,620   13,080   39,620 13,080  
Notes Payable $ 199,500   $ 257,000   $ 199,500 $ 257,000  
Ratios/Supplemental Data:              
Ratio of net expenses to average net assets – annualized         11.38% 8.77%  
Ratio of net investment income to average net assets – annualized         9.60% 9.35%  
Ratio of expenses to average net assets - annualized         14.32% 12.53%  
Ratio of net investment income (loss) to average net assets – annualized         6.71% 5.65%  
[1] Refer to Note 9 – Distributions to Common Stockholders in the accompanying Notes to Consolidated Financial Statements for additional information.