Note 6 - Fair Value - Schedule of Valuation Techniques and Assumptions (Details) (Parentheticals) - Fair Value, Inputs, Level 3 [Member] $ in Thousands		Dec. 31, 2024		Dec. 31, 2023 USD ($) yr
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input		0.8
Measurement Input		0.8
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Maximum [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	1
Measurement Input	[1],[2]	1
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	1
Measurement Input	[3]	1
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, EBITDA Multiple [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input	[3]			8
Measurement Input	[3]			8
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, EBITDA Multiple [Member] | Maximum [Member]
Investment Company, Investment Owned, Measurement Input	[3]			1
Measurement Input	[3]			1
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, EBITDA Multiple [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]			0.9
Measurement Input	[3]			0.9
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Maturity [Member]
Investment Company, Investment Owned, Measurement Input		5	[1],[2]	5	[3],[4]
Measurement Input		5	[1],[2]	5	[3],[4]
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Maturity [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	5		5
Measurement Input	[3]	5		5
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]
Investment Company, Investment Owned, Measurement Input		50	[1],[2]	0.50	[3],[4]
Measurement Input		50	[1],[2]	0.50	[3],[4]
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	50		0.50
Measurement Input	[3]	50		0.50
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investment Company, Investment Owned, Measurement Input		4.38	[1],[2]	0.0384	[3],[4]
Measurement Input		4.38	[1],[2]	0.0384	[3],[4]
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	4.38		0.0384
Measurement Input	[3]	4.38		0.0384
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Discount for Lack of Marketability [Member]
Investment Company, Investment Owned, Measurement Input	[1]	22.8	[2]	0.227	[4]
Measurement Input	[1]	22.8	[2]	0.227	[4]
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Discount for Lack of Marketability [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	22.8		0.227
Measurement Input	[3]	22.8		0.227
Aerospace Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, EBITDA Multiple [Member]
Investment Company, Investment Owned, Measurement Input	[3],[4]			2.1
Measurement Input	[3],[4]			2.1
Aerospace Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, EBITDA Multiple [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]			2.1
Measurement Input	[3]			2.1
Equipment Leasing Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]
Investment Company, Investment Owned, Measurement Input		50	[1],[2]	0.50	[3],[4]
Measurement Input		50	[1],[2]	0.50	[3],[4]
Equipment Leasing Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	50		0.50
Measurement Input	[3]	50		0.50
Equipment Leasing Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investment Company, Investment Owned, Measurement Input		4.38	[1],[2]	0.0384	[3],[4]
Measurement Input		4.38	[1],[2]	0.0384	[3],[4]
Equipment Leasing Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	4.38		0.0384
Measurement Input	[3]	4.38		0.0384
Equipment Leasing Sector [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Expected Term [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	5
Measurement Input	[1],[2]	5
Equipment Leasing Sector [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Expected Term [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	5
Measurement Input	[3]	5
Equipment Leasing Sector [Member] | Valuation Technique, Liquidation Value [Member] | Measurement Input, Maturity [Member]
Investment Company, Investment Owned, Measurement Input | yr	[3],[4]			5
Measurement Input | yr	[3],[4]			5
Equipment Leasing Sector [Member] | Valuation Technique, Liquidation Value [Member] | Measurement Input, Maturity [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input | yr	[3]			5
Measurement Input | yr	[3]			5
Automotive Sector [Member] | Measurement input, Market Value of Invested Capital [Member] | Measurement Input, Maturity [Member]
Investment Company, Investment Owned, Measurement Input | $				0
Measurement Input | $				0
Automotive Sector [Member] | Measurement input, Market Value of Invested Capital [Member] | Measurement Input, Maturity [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input | $				0
Measurement Input | $				0
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input		0.7		1.2	[3]
Measurement Input		0.7		1.2	[3]
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Maximum [Member]
Investment Company, Investment Owned, Measurement Input		1.1	[1],[2]	1.5
Measurement Input		1.1	[1],[2]	1.5
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input		0.9	[3]	1.4
Measurement Input		0.9	[3]	1.4
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	55
Measurement Input	[1],[2]	55
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	55
Measurement Input	[3]	55
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investment Company, Investment Owned, Measurement Input		4.27	[1],[2]	0.0401
Measurement Input		4.27	[1],[2]	0.0401
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Risk Free Interest Rate [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input		4.27	[3]	0.0401
Measurement Input		4.27	[3]	0.0401
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Going Concern Probability [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	10
Measurement Input	[1],[2]	10
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Going Concern Probability [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	10
Measurement Input	[3]	10

[1] An increase in the input would result in an increase in the security’s valuation; a decrease in the input would result in a decrease in the security’s valuation.

[2] An increase in the inputs would result in a decrease in the securities valuation; a decrease in the input would result in an increase in the security's valuation.

[3] Weighted average is calculated by weighing the significant unobservable input by the relative fair value of each investment in the category.

[4] As of December 31, 2022, the Fund used various methods to develop fair market estimates.