Note 10 - Marketable Securities - Net Gains and Losses on Marketable Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net gains recognized during the period on marketable securities	$ 17,742	$ 12,350
Less: Net losses (gains) realized on marketable securities sold during the period	(27,948)	1,507
Net unrealized (losses) gains recognized during the reporting period on marketable securities still held at the reporting date	$ (10,206)	$ 13,857

Amount of realized gain (loss) on investment in debt and equity securities.

Amount of unrealized gain (loss) on investment in debt and equity securities.