Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance, beginning of the year	$ 1,914	$ 194	$ 167
Provision for doubtful accounts	57	1,609	52
Amounts recovered	(360)
Amounts written off		(6)	(16)
Translation adjustments	(86)	117	(9)
Balance, end of the year	$ 1,525	$ 1,914	$ 194