Note 13 - Employee Benefit Plans - Components of Periodic Pension Costs and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interest cost	$ 423	$ 438
Expected return on plan assets	(672)	(661)
Amortization of prior service beneft and net loss	252	239
Net periodic pension benefit	3	16
Amortization of prior service benefit and net loss	(252)	(239)
Net loss	253	588
Total recognized in other comprehensive loss	1	349
Total recognized in net periodic benefit and other comprehensive loss	$ 4	$ 365