Note 3 - Summary of Significant Accounting Policies - Contract liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 2,006	$ 1,061
Exchange translation adjustment	139	(17)
Revenue recognized from beginning contract liability balance		(1,027)
Advances received from customers related to unsatisfied performance obligations	1,323	1,989
Revenue recognized from beginning contract liability balance	(2,032)
Balance	$ 1,436	$ 2,006