Note 9 - 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%
Income Tax Expense (Benefit), Continuing Operations, Valuation Allowance on Foreign Tax Credits and Net Operating Losses	$ 2,900	$ 5,300	$ 2,800
Net Operating Loss		300	$ 200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0	$ 0