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Consolidated Schedule of Investments (Parenthetical) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Percentage of debt securities contains floor rates		77.40%	78.80%
Aggregate cost of investments		$ 620,821	$ 652,217
Aggregate gross unrealized appreciation		35,600	34,800
Aggregate gross unrealized depreciation		38,800	38,300
Net unrealized depreciation		$ 3,200	$ 3,400
Percentage of qualifying assets to total assets		83.10%	82.40%
Maximum
Schedule of Investments [Line Items]
Floor rate		2.00%	2.00%
Minimum
Schedule of Investments [Line Items]
Floor rate		0.50%	0.50%
Investments
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		239.00%	247.00%
Garrison Capital Equity Holdings II LLC
Schedule of Investments [Line Items]
Non controlling member interest rate		17.50%	17.50%
ATP Oil & Gas Corporation
Schedule of Investments [Line Items]
Royalty interest		5.00%	5.00%
Junior Secured Loan
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		23.00%	24.00%
Aggregate cost of investments		$ 64,319	$ 65,776
Senior Unsecured Bond
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		0.00%	0.00%
Aggregate cost of investments		$ 416	$ 416
Senior Unsecured Bond | Tank Partners Equipment Holdings, LLC
Schedule of Investments [Line Items]
Percentage of net asset value at fair value			10.00%
Equity Securities
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		7.00%	9.00%
Aggregate cost of investments		$ 24,345	$ 28,848
CLO Subordinated Investments
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		9.00%	9.00%
Asset Manager Affiliates
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		0.00%	0.00%
Aggregate cost of investments	[1]	$ 17,791	$ 17,791
Joint Ventures
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		27.00%	25.00%
Aggregate cost of investments		$ 74,394	$ 68,850
Derivatives
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		0.00%	0.00%
Aggregate cost of investments		$ 31
Senior Secured Loan
Schedule of Investments [Line Items]
Percentage of net asset value at fair value		174.00%	180.00%
Aggregate cost of investments		$ 408,665	$ 435,856
Investments For Federal Income Tax Purpose
Schedule of Investments [Line Items]
Aggregate cost of investments		$ 624,000	$ 656,000
Controlled Affiliated Investments | Minimum
Schedule of Investments [Line Items]
Percentage of outstanding voting securities owned		25.00%	25.00%
Non-controlled Affiliated Investments | Minimum
Schedule of Investments [Line Items]
Percentage of outstanding voting securities owned		5.00%	5.00%
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