Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit), Total			$ 3,200
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)			$ 100
Deferred Tax Assets, Operating Loss Carryforwards, Total	$ 5,808	$ 2,227
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount	$ 2,300	$ 1,600