Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total	7.60%	42.50%
Other Noncurrent Liabilities [Member]
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0