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Financial Highlights - Schedule of Financial Highlights (Details) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Mar. 24, 2025
Investment Company [Abstract]              
Net Asset Value Per Share, Beginning Balance [1] $ 5.21 $ 6.09 $ 6.5 $ 6.92 $ 7.79 $ 10.51  
Net investment income [1] 0.22 0.46 0.65 0.62 0.65 1.03  
Net realized and unrealized gains (losses) [1] 0.2 (0.74) (0.43) (0.44) (0.82) (2.82)  
Net increase (decrease) in net assets resulting from operations [1] 0.42 (0.28) 0.22 0.18 (0.17) (1.79)  
Dividends from net investment income [1],[2] (0.24) (0.6) (0.63) (0.6) (0.7) (0.93)  
Distributions from net realized gains [1],[2] 0 0 0 0 0 0  
Net decrease in net assets resulting from capital transactions [1],[2] (0.24) (0.6) (0.63) (0.6) (0.7) (0.93)  
Net Asset Value Per Share, Ending Balance [1] 5.39 5.21 6.09 6.5 6.92 7.79  
Market value per share, end of year $ 3.03 [1] $ 3.36 [1] $ 3.62 [1] $ 4.24 [1] $ 5.4 [1] $ 3.49 [1] $ 5.39
Total return based on market value [3] (2.12%) 10.52% 1.65% (11.29%) 80.93% (43.32%)  
Shares outstanding at end of year 14,406,244 14,403,752 14,391,775 14,385,810 13,921,767 13,885,335  
Net assets, at end of year $ 77,602,130 $ 75,010,209 $ 87,700,308 $ 93,509,392 $ 96,355,849 $ 108,124,995  
Ratio of total expenses to average net assets [4] 22.03% 22.29% 19.58% 16.15% 16.93% 16.02%  
Ratio of net expenses to average net assets [4] 21.70% 21.83% 19.15% 15.67% 16.58% 15.56%  
Ratio of interest expense and fees and amortization of deferred debt issuance costs to average net assets [4] 10.39% 11.59% 10.11% 7.33% 6.96% 7.41%  
Ratio of net investment income before fee waiver to average net assets [4],[5] 7.72% 7.86% 10.03% 8.53% 8.24% 10.39%  
Ratio of net investment income after fee waiver to average net assets [4] 8.05% 8.32% 10.46% 9.02% 8.58% 10.86%  
Total Borrowings $ 123,500,000 $ 108,000,000 $ 136,900,000 $ 149,000,000 $ 167,000,000 $ 183,375,000  
Asset Coverage Ratio [6] 1.63% 1.69% 1.64% 1.63% 1.58% 1.59%  
Portfolio Turnover Rate 12.00% 31.00% 22.00% 58.00% 35.00% 33.00%  
[1] All per share data activity is calculated based on the weighted average shares outstanding for the relevant period, except net increase (decrease) in net assets from capital share transactions, which is based on the common shares outstanding as of the relevant balance sheet date.
[2] The per share data for dividends and distributions declared reflects the actual amount of the dividends and distributions declared per share during the period.
[3] Total returns are historical and are calculated by determining the percentage change in the market value with all dividend distributions, if any, reinvested. Dividends and distributions are assumed to be reinvested at prices obtained under the company’s dividend reinvestment plan. Total investment return does not reflect sales load.
[4] Ratios are annualized for the Six Months Ended December 31, 2024.
[5] Percentages have been revised for the twelve months ended June 30, 2024, 2023, 2022 and 2021.
[6] Asset coverage ratio is equal to (i) the sum of (A) net assets at the end of the period and (B) debt outstanding at the end of the period, divided by (ii) total debt outstanding at the end of the period