Note 10 - Accrued Pension Liabilities - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Service cost	$ 5	$ 4	$ 4
Interest cost	15	14	17
Expected return on plan assets			(3)
Amortization of net loss	19	22	15
Net periodic benefit cost	$ 39	$ 40	$ 33