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Financial Highlights - Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Per share data:    
Net asset value at beginning of period (in dollars per share) $ 9.40 $ 10.39
Net investment income (in dollars per share) 0.25 0.31
Net gain (loss) (in dollars per share) (0.10) (0.16)
Net increase (decrease) in net assets resulting from operations (in dollars per share) 0.15 0.15
Stockholder distributions - income (in dollars per share) (0.25) (0.25)
Net asset value at end of period (in dollars per share) $ 9.30 $ 10.29
Net assets at end of period $ 201,502 $ 222,961
Shares outstanding at end of period (in shares) 21,666,340 21,666,340
Per share market value at end of period (in dollars per share) $ 7.20 $ 7.65
Total return based on market value 5.30% (7.55%)
Total return based on average net asset value 1.58% 1.50%
Ratio/Supplemental data:    
Ratio of net investment income to average net assets 12.90% 14.26%
Ratio of total expenses to average net assets 17.24% 16.17%
Portfolio turnover 2.44% 4.15%