Note 7 - Investments in Equity Securities (Details Textual) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Equity Securities, FV-NI, Unrealized Gain		$ 67,928	$ 0
Equity Securities, FV-NI, Unrealized Loss		0	0
Equity Securities, FV-NI, Realized Gain		$ 152,748	0
Equity Securities, FV-NI, Realized Loss	$ 0		$ 0