Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended			36 Months Ended	48 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2021
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total					$ 0
Operating Loss Carryforwards, Total					29,455,176
Net Operating Loss That Can Be Carried Forward Indefinitely	$ 2,272,315	$ 2,730,461	$ 4,410,916	$ 9,413,692	9,413,692
Expiring in 2021 [Member]
Operating Loss Carryforwards, Total					$ 10,700,000