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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Net (decrease) increase in net assets resulting from operations	$ (17,185)	$ 21,151	$ 27,782
Net unrealized appreciation (depreciation) on investments	(48,780)	(5,552)	3,205
Other book-tax differences	931	3,292	1,462
Change in capital loss carry forward	29,853	9,484	3,643
Taxable income before deductions for distributions	$ 62,379	$ 39,479	$ 29,682

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