Note 2 - Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Investments, fair value	$ 3,161,359	$ 3,161,359
Fair Value, Inputs, Level 1 [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Investments, fair value	3,161,359	3,161,359
Publicly Traded Common Stock [Member]
Investments, fair value	0	0
Publicly Traded Common Stock [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments, fair value	0	0
Private Company Common Stock [Member]
Investments, fair value	2,961,359	2,961,359
Private Company Common Stock [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments, fair value	0	0
Private Company Common Stock [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments, fair value	2,961,359	2,961,359
Private Company Preferred Stock [Member]
Investments, fair value	200,000	200,000
Private Company Preferred Stock [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments, fair value	0	0
Private Company Preferred Stock [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments, fair value	$ 200,000	$ 200,000

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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