Note 11 - Accrued Pension Liabilities - Changes in the Pension Plans' Benefit Obligation and Fair Value of Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated benefit obligation	$ 951	$ 815
Benefit obligation at beginning of year	827	883
Service cost	5	5	$ 4
Interest cost	15	15	14
Benefits paid from the plan	(8)	(8)
Actuarial (gain) loss	145	(27)
Exchange rates and others	(21)	(41)
Benefit obligation at end of year	$ 963	$ 827	$ 883