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Financial Highlights - Schedule of Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment Company, Financial Highlights [Line Items]                    
Net asset value at beginning of period $ 19.37 [1] $ 19.43 $ 19.96 $ 16.81 $ 16.85 $ 16.47 $ 16.05 $ 15.76 $ 15.17 $ 15.16
Net investment income 2.29 2.47 1.9 1.03 1.62 1.31 1.43 1.44 1.45 1.64
Net realized gain (loss) on investments, net of tax (provision) 0.31 0.85 2.61 2.19 (0.06) (0.05) (0.45) 0.67 (0.77) 0.58
Taxes paid on deemed distributions     (0.35)              
Net unrealized appreciation (depreciation) on investments (0.18) (0.39) (2.69) 1.7 (0.27) 0.74 1.05 (0.23) 1.59 (0.62)
Realized losses on extinguishment of debt (0.02)   (0.01) (0.17) (0.01) (0.02) (0.01) (0.01)    
Total increase from investment operations 2.4 2.93 1.46 4.75 1.28 1.98 2.02 1.87 2.27 1.6
Accretive (dilutive) effect of share issuances and repurchases   0.02 0.02   0.01   0.01 0.02 (0.05) 0.02
Dividends declared to stockholders (2.08) (2.37) (1.19) (1.6) (1.33) (1.6) (1.6) (1.6) (1.6) (1.6)
Distributions from capital gains (0.34) (0.51) (0.81)              
Other (0.02) (0.13) (0.01)       (0.01)   (0.03) (0.01)
Net asset value at end of period 19.33 [1] 19.37 [1] 19.43 19.96 16.81 16.85 16.47 16.05 15.76 15.17
Market value at end of period $ 21.02 $ 19.69 $ 19.03 $ 17.98 $ 13.1 $ 14.84 $ 11.69 $ 15.18 $ 15.73 $ 13.69
Shares outstanding at end of period 33,914,652 30,438,979 24,727,788 24,437,400 24,437,400 24,463,119 24,463,119 24,507,940 22,446,076 16,300,732
Weighted average number of shares outstanding - basic 32,585,238 26,365,269 24,468,172 24,437,400 24,442,431 24,463,119 24,471,730 23,527,188 18,283,715 16,201,449
Weighted average number of shares outstanding - diluted 32,585,238 26,365,269 24,468,172 24,437,400 24,442,431 24,463,119 24,471,730 23,527,188 18,283,715 16,201,449
Net assets at end of period $ 655,666 $ 589,474 $ 480,343 $ 487,764 $ 410,760 $ 412,310 $ 402,985 $ 393,273 $ 353,785 $ 247,362
Average net assets $ 631,801 $ 517,287 $ 482,594 $ 437,690 $ 392,866 $ 404,284 $ 398,440 $ 376,292 $ 289,453 $ 245,706
Total expenses 11.60% 12.90% 12.00% 15.40% 11.80% 11.20% 10.70% 9.80% 11.70% 11.30%
Net investment income 11.80% 12.60% 9.60% 5.70% 10.10% 7.90% 8.80% 9.00% 9.20% 10.80%
Total return based on market value 20.10% 17.80% 17.70% 53.90% 1.00% 37.60% (15.80%) 3.20% 23.80% 2.40%
Total return based on net asset value 12.40% 15.10% 7.30% 28.30% 7.60% 12.00% 12.60% 11.90% 15.00% 10.60%
Portfolio turnover ratio 26.30% 28.30% 23.90% 47.70% 25.80% 17.20% 29.50% 29.50% 29.30% 22.50%
Average debt outstanding $ 474,897 $ 455,053 $ 397,244 $ 380,997 $ 385,350 $ 319,050 $ 271,560 $ 219,920 $ 221,200 $ 199,340
Average debt per share $ 14.57 $ 17.26 $ 16.24 $ 15.59 $ 15.77 $ 13.04 $ 11.1 $ 9.35 $ 12.1 $ 12.3
[1] Net asset value per share is determined as of the last day in the relevant quarter and therefore may not reflect the net asset value per share on the date of the high and low sales prices. The net asset values shown are based on outstanding shares at the end of each period.