Note 11 - Accrued Pension Liabilities - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Service cost	$ 5	$ 5	$ 4
Interest cost	15	15	14
Actuarial loss	4
Amortization of net loss	16	19	22
Net periodic benefit cost	$ 40	$ 39	$ 40