Note 10 - Accrued Pension Liabilities - Changes in the Pension Plans' Benefit Obligation and Fair Value of Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated benefit obligation	$ 815	$ 871
Benefit obligation at beginning of year	883	803
Service cost	5	4	$ 4
Interest cost	15	14	17
Benefits paid from the plan	(8)	(22)
Actuarial (gain) loss	(27)	(22)
Exchange rates and others	(41)	106
Benefit obligation at end of year	$ 827	$ 883	$ 803