Note 7 - Investments in Equity Securities - Schedule of Fair Value of Investments (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 657,971	$ 1,518,244	$ 1,534,400
Reported Value Measurement [Member]
Balance	657,971	1,518,244
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Balance	657,971	1,518,244
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Balance	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Balance	$ 0	$ 0