Note 7 - Marketable Securities - Net Gains and Losses on Marketable Securities (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net (losses) gains recognized during the period on marketable securities	$ (460,278)	$ 137,574	$ (853,938)	$ 65,527
Less: Net (losses) gains recognized on marketable securities sold during during the period	(207,936)	112,180	(207,936)	112,180
Unrealized (losses) gains recognized during the reporting period on marketable securities still held at the reporting date	$ (252,342)	$ 25,394	$ (646,002)	$ (46,653)