Note 2 - Fair Value Measurements - Investments Measured at Fair Value Using Significant Unobservable Inputs (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Private Company Preferred Stock [Member] \| Valuation, Cost Approach [Member] \| Purchase Price [Member]
Investments, fair value	$ 200,000	$ 200,000
Investments, Fair Value Disclosure	200,000	200,000
Private Company Common Stock [Member] \| Valuation, Cost Approach [Member] \| Purchase Price [Member]
Investments, fair value	562	562
Investments, Fair Value Disclosure	562	562
Private Company Common Stock [Member] \| Valuation, Market Approach [Member] \| Measurement Input, Quoted Price [Member]
Investments, fair value	2,960,797	2,960,797
Investments, Fair Value Disclosure	$ 2,960,797	$ 2,960,797

- 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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