Note 6 - Fair Value - Schedule of Balance Sheet Grouping (Details) - USD ($)		Dec. 31, 2024		Dec. 31, 2023
Investments, fair value		$ 1,060,474		$ 8,733,779	[1]
Fair Value, Inputs, Level 1 [Member]
Investments, fair value		745,224		3,935,907
Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0		0
Fair Value, Inputs, Level 3 [Member]
Investments, fair value		315,250		4,797,872
Advanced Materials Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		300,000	[2]	400,000	[3]
Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	[2]	100,000	[3]
Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		0	[2]	100,000	[3]
Aerospace Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	[3]			4,200,000
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0		3,862,405
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		260,497		299,987
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		260,497		299,932
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				55
Common Stock [Member] | Semiconductor Equipment [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value				3,862,405
Common Stock [Member] | Semiconductor Equipment [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value				0
Common Stock [Member] | Semiconductor Equipment [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		29,466		110,172
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0		0
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0		0
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		29,466		110,172
Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0
Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0
Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		25,287
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		0
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		25,287
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value		745,224		73,502
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value		0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value		$ 0
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value				0
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Contract [Member]
Investments, fair value				0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value				0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Contract [Member]
Investments, fair value				0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value				0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Contract [Member]
Investments, fair value				0
Convertible Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value				0
Convertible Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value				0
Convertible Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value				4,387,713
Convertible Debt [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value				0
Convertible Debt [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value				0
Convertible Debt [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value				100,000
Convertible Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value				0
Convertible Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value				0
Convertible Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value				87,713
Convertible Debt [Member] | Aerospace Sector [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value				0
Convertible Debt [Member] | Aerospace Sector [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value				0
Convertible Debt [Member] | Aerospace Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value				$ 4,200,000

[1] Includes warrants whose primary risk exposure is equity contracts.

[2] 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.

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