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Note 8 - Federal Income Tax - Reconciliation of Net Increase in Net Assets to Taxable Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net (decrease) increase in net assets resulting from operations	$ (5,633)	$ (17,185)	$ 21,151
Net unrealized appreciation (depreciation) on investments	(18,785)	(48,780)	(5,552)
Other book-tax differences	1,455	931	3,292
Change in capital loss carry forward	34,631	29,853	9,484
Taxable income before deductions for distributions	$ 49,238	$ 62,379	$ 39,479

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