Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Effective Income Tax Rate Reconciliation, Percent, Total	30.00%	27.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 1,275	$ (0)
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	89,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 123,000