Note 11 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Federal statutory rate	21.00%	21.00%
State tax, net of federal benefit	0.00%	(0.10%)
Deferred correction – State NOLs	0.00%	(359.70%)
FIN 48 unrecognized tax benefits	(4.90%)
State tax credits true-up	(4.70%)	0.00%
Permanent differences	(4.30%)	2.30%
Valuation allowance increase	(16.20%)	360.40%
Other, net	5.30%	(24.00%)
Effective income tax rate	(3.80%)	0.00%