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Earnings (Losses) Per Share - Schedule of Basic and Diluted Net Increase (Decrease) In Stockholders' Equity Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 [2]
Dec. 31, 2018
 [2]
Earnings Per Share [Abstract]                          
Net Income (Loss) Attributable to Parent $ (12,416) $ (4,205) $ (8,433) $ 4,058 $ (2,000) $ 9,144 $ 10,844 $ 8,037 $ (20,996) $ 26,026 $ 31,573    
Weighted average number of common and common stock equivalent shares outstanding for basic shares computation [1]                 9,634,468 8,536,079 4,998,759    
Weighted average number of common and common stock equivalent shares outstanding for diluted shares computation [1]                 9,634,468 8,536,079 4,998,759    
Net increase (decrease) in net assets from operations, Basic $ (1.28) $ (0.44) $ (0.88) $ 0.42 $ (0.21) $ 1.00 $ 1.40 $ 1.07 $ (2.18) [1],[2] $ 3.05 [1],[2] $ 6.32 [1],[2] $ (3.34) $ (2.56)
Net increase (decrease) in net assets from operations, Diluted $ (1.28) $ (0.44) $ (0.88) $ 0.42 $ (0.21) $ 1.00 $ 1.40 $ 1.07 $ (2.18) [1] $ 3.05 [1] $ 6.32 [1]    
[1] The Company completed a Reverse Stock Split of 10 to 1 effective August 26, 2021, the weighted average shares outstanding and per share values have been adjusted retroactively to reflect the split for all periods presented.
[2] Totals may not sum due to rounding.