Note 3 - Summary of Significant Accounting Policies - Contract liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 1,436	$ 2,006
Exchange translation adjustment	34	139
Revenue recognized from beginning contract liability balance	(1,390)	(2,032)
Advances received from customers related to unsatisfied performance obligations	1,165	1,323
Balance	$ 1,245	$ 1,436