Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	9.50%	72.90%	9.90%	20.60%
Other Noncurrent Liabilities [Member]
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0		$ 0