Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance, beginning of the year	$ 962	$ 1,525	$ 1,914
Amounts provided	635	6	57
Amounts recovered	(86)	(505)	(360)
Amounts written off	(78)	(33)	0
Translation adjustments	90	(31)	(86)
Balance, end of the year	$ 1,523	$ 962	$ 1,525