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Note 10 - Marketable Securities - Net Gains and Losses on Marketable Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net gains recognized during the period on marketable securities	$ 12,350	$ 41,496
Less: Net losses realized on marketable securities sold during the period	1,507	0
Net unrealized gains recognized during the reporting period on marketable securities still held at the reporting date	$ 13,857	$ 41,496

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

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