Note 10 - Income Taxes - Reconciliations of Federal Statutory Rate to Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
U.S. federal statutory tax rate	21.00%	21.00%
State tax benefit, net	(7.61%)	7.52%
Stock compensation	(4.15%)	(5.16%)
Officers compensation	(69.84%)	0.00%
Attributes expiration	(148.01%)	(38.04%)
Other adjustment	0.87%	(0.85%)
Interest and penalties	(14.27%)	0.00%
Valuation allowance	180.11%	9.75%
Effective income tax rate	(41.90%)	(5.78%)