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

FINANCIAL HIGHLIGHTS (Details)

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FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Investment Company, Financial Highlights [Roll Forward]                    
Net asset value at beginning of period / year (in USD per share) $ 21.18 [1] $ 18.79 $ 18.16 $ 18.56 $ 14.80 $ 16.44 $ 16.64 $ 16.80 $ 17.24 $ 18.12
Income from operations                    
Net investment income (in USD per share) 2.02 [2] 2.11 [2] 2.20 [2] 1.88 1.58 1.62 1.68 1.70 1.68 1.68
Net realized and unrealized gain (loss) on investments (in USD per share) 0.57 2.05 0.07 (0.70) 3.58 (1.68) (0.30) (0.32) (0.24) (0.70)
Net realized and unrealized gain (loss) on other (in USD per share) 0.01 0.18 0.02 (0.02) (0.08) (0.06) (0.02) 0 (0.10) 0
Preferred stock dividends (in USD per share) (0.04) 0 0 0 0 0 0 0 0 0
Total from operations (in USD per share) 2.56 4.34 2.29 1.16 5.08 (0.12) 1.36 1.38 1.34 0.98
Distributions to common stockholders from                    
Net investment income (in USD per share) (1.98) [3],[4] (1.98) [3],[4] (1.89) [3],[4] (1.52) (1.50) (1.60) (1.64) (1.68) (1.68) (1.40)
Realized gains (in USD per share) (0.50) [3],[4] 0 [3],[4] (0.00) [3],[4] 0 0 0 0 0 0 (0.28)
Return of capital (in USD per share) 0 0 0 (0.08) (0.06) (0.02) (0.04) 0 0 0
Total distributions (in USD per share) (2.48) (1.98) (1.89) (1.60) (1.56) (1.62) (1.68) (1.68) (1.68) (1.68)
Discounts, commissions, and offering costs (in USD per share) 0 0 0 0 (0.02) 0 (0.02) (0.02) (0.08) (0.10)
Repurchase of common stock (in USD per share) 0 0 0 0 0 0 0 0 0 0.04
Net anti-dilutive (dilutive) effect of equity offering (in USD per share) 0.08 0.05 0.26 0.04 0.30 0.10 0.14 0.16 (0.04) (0.10)
Total capital share transactions (in USD per share) 0.08 0.05 0.26 0.04 0.28 0.10 0.12 0.14 (0.12) (0.16)
Other, net (in USD per share) 0 (0.02) (0.03) 0 (0.04) 0 0 0 0.02 (0.02)
Net asset value at end of period / year (in USD per share) 21.34 [1] 21.18 [1] 18.79 18.16 18.56 14.80 16.44 16.64 16.80 17.24
Per common share market value at beginning of year (in USD per share) 24.05 19.28 16.98 22.60 14.82 19.50 19.00 19.00 16.26 16.26
Per common share market value at end of year (in USD per share) $ 21.87 $ 24.05 $ 19.28 $ 16.98 $ 22.60 $ 14.82 $ 19.50 $ 19.00 $ 19.00 $ 16.26
Total return (0.17%) 36.61% 24.85% (19.16%) 64.93% (15.75%) 12.55% 9.53% 27.90% 11.68%
Common stock outstanding at end of year (in shares) 22,593,069 22,230,587 21,754,449 17,367,398 17,152,186 15,783,425 15,172,962 14,250,990 13,080,342 11,672,211
Statement of Assets and Liabilities Data:                    
Net assets at end of year $ 482,035 $ 470,895 $ 408,695 $ 315,487 $ 318,439 $ 233,743 $ 249,330 $ 237,092 $ 219,650 $ 201,207
Average net assets 479,038 431,796 349,518 320,838 275,509 235,266 239,851 234,092 215,421 193,228
Senior Securities Data:                    
Borrowings under line of credit, at cost 0 70,600 47,800 141,800 50,500 128,000 66,900 110,000 93,000 71,300
Preferred Stock 21,636 8,748 0 0 0 0 51,750 51,750 51,750 61,000
Notes Payable $ 406,500 $ 257,000 $ 257,000 $ 200,000 $ 188,813 $ 96,313 $ 57,500 $ 0 $ 0 $ 0
Ratios/Supplemental Data:                    
Ratio of net expenses to average net assets 9.17% 11.71% 12.99% 9.62% 10.04% 9.69% 10.61% 9.61% 8.26% 10.16%
Ratio of net investment income to average net assets 9.44% 10.67% 11.74% 10.06% 9.48% 10.70% 10.25% 9.86% 9.95% 10.08%
Ratio of expenses to average net assets - annualized 12.72% 14.53% 16.31% 13.13% 13.17% 14.36% 14.18% 13.12% 12.14% 13.40%
Ratio of net investment income (loss) to average net assets – annualized 5.93% 7.90% 8.49% 6.61% 6.40% 6.11% 6.74% 6.41% 6.13% 6.90%
[1] Issued and outstanding shares of common stock and net asset value per share have been adjusted on a retroactive basis to reflect the 1-for-2 reverse stock split (the “Reverse Stock Split”) effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.
[2] Per share amounts and weighted average common shares outstanding have been adjusted on a retroactive basis to reflect the Reverse Stock Split effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.
[3] Per share amounts have been adjusted on a retroactive basis to reflect the Reverse Stock Split effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.
[4] Refer to Note 9 – Distributions to Common Stockholders for additional information.