Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total	12.10%	(9.50%)	(2.80%)	(9.90%)
Other Noncurrent Liabilities [Member]
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0		$ 0