Note 7 - Investments in Equity Securities - Schedule of Fair Value of Investments (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Balance	$ 1,644,975	$ 1,534,400	$ 1,534,400
Reported Value Measurement [Member]
Balance	1,644,975	1,534,400
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Balance	1,644,975	1,534,400
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Balance
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Balance