Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investment Company, Net Assets [Roll Forward]
Balance (in shares)	13,398,078	13,398,078	13,398,078
Balance	$ 172,225	$ 162,004	$ 180,423
Net increase (decrease) in net assets resulting from operations:
Net investment income	12,384	16,712	20,160
Net realized losses on investments, net of taxes	(12,158)	(17,121)	(11,405)
Net unrealized (appreciation) depreciation on investments, net of deferred taxes	(32,815)	28,851	(9,007)
Loss on extinguishment of debt	(504)	0	(213)
Tax reclassifications of permanent differences	0	0
Distributions from net investment income	(5,228)	(18,221)	(17,954)
Distributions from tax return of capital	(10,716)	0	0
Net increase (decrease)	$ (49,037)	$ 10,221	$ (18,419)
Balance (in shares)	13,398,078	13,398,078	13,398,078
Balance	$ 123,188	$ 172,225	$ 162,004
Common Stock
Investment Company, Net Assets [Roll Forward]
Balance (in shares)	13,398,078	13,398,078	13,398,078
Balance	$ 134	$ 134	$ 134
Net increase (decrease) in net assets resulting from operations:
Net increase (decrease) (in shares)	0	0	0
Balance (in shares)	13,398,078	13,398,078	13,398,078
Balance	$ 134	$ 134	$ 134
Paid-in capital in excess of par
Investment Company, Net Assets [Roll Forward]
Balance	184,912	184,841	184,841
Net increase (decrease) in net assets resulting from operations:
Tax reclassifications of permanent differences	(1)	71
Distributions from tax return of capital	(10,716)
Net increase (decrease)	(10,717)	71	0
Balance	174,195	184,912	184,841
Total distributable earnings (accumulated losses)
Investment Company, Net Assets [Roll Forward]
Balance	(12,821)	(22,971)	(4,552)
Net increase (decrease) in net assets resulting from operations:
Net investment income	12,384	16,712	20,160
Net realized losses on investments, net of taxes	(12,158)	(17,121)	(11,405)
Net unrealized (appreciation) depreciation on investments, net of deferred taxes	(32,815)	28,851	(9,007)
Loss on extinguishment of debt	(504)		(213)
Tax reclassifications of permanent differences	1	(71)	0
Distributions from net investment income	(5,228)	(18,221)	(17,954)
Net increase (decrease)	(38,320)	10,150	(18,419)
Balance	$ (51,141)	$ (12,821)	$ (22,971)