Note 6 - Fair Value - Schedule of Valuation Techniques and Assumptions (Details) (Parentheticals) - Fair Value, Inputs, Level 3 [Member]		Dec. 31, 2025	Dec. 31, 2024
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input		0.9	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]	0.8	1
Advanced Materials Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	0.9	1
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Maturity [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	5	5
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
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	50	50
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	50
Advanced Materials Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	3.73	4.38
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]	3.73	4.38
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],[2]	22.8	22.8
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	22.8
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input		0.5	0.7
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Maximum [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	0.4	1.1
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Revenue Multiple [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	0.5	0.9
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	55	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	55
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	3.55	4.27
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Risk Free Interest Rate [Member] | Weighted Average [Member]
Investment Company, Investment Owned, Measurement Input	[3]	3.55	4.27
Medical Devices Sector [Member] | Valuation, Market Approach [Member] | Measurement Input, Going Concern Probability [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]	5	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]	5	10
Equipment Leasing Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]		50
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
Equipment Leasing Sector [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investment Company, Investment Owned, Measurement Input	[1],[2]		4.38
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
Equipment Leasing Sector [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Expected Term [Member]
Investment Company, Investment Owned, 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

[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.