Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total	38.20%	3.20%	30.20%	65.00%
Accrued Income Taxes, Total	$ 44		$ 44
Income Tax Expense (Benefit), Total	$ 111	$ (4)	$ (596)	$ 26