Note 6 - Fair Value - Schedule of Balance Sheet Grouping (Details) - USD ($)		Dec. 31, 2025	Dec. 31, 2024
Investments, fair value		$ 225,436	$ 1,060,474
Fair Value, Inputs, Level 1 [Member]
Investments, fair value		56,271	745,224
Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Fair Value, Inputs, Level 3 [Member]
Investments, fair value		169,165	315,250
Advanced Materials Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	[1]	200,000	300,000
Automotive Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	[1]	0	0
Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	[1]		0
Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	[1]	0	0
Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	[1]	0	0
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		167,642	260,497
Common Stock [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Common Stock [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Common Stock [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		167,642	260,497
Common Stock [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Common Stock [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Common Stock [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	0
Common Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value			0
Common Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value			0
Common Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value			0
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	29,466
Preferred Stock [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value			0
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value			0
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value			29,466
Preferred Stock [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Preferred Stock [Member] | Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	0
Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		1,523	25,287
Debt [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Debt [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Debt [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	0
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		1,523	25,287
Debt [Member] | Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0	0
Debt [Member] | Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Debt [Member] | Semiconductor Equipment Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		56,271	745,224
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		$ 0	$ 0

[1] As of December 31, 2023, the Fund used Liquidation Value and Market Comparable Companies approaches to value certain investments. As of December 31, 2024, the Fund discontinued these approaches in certain cases in which more reliable indications of value were developed.