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, 2019	Dec. 31, 2018
Interest cost	$ 443	$ 423
Expected return on plan assets	(626)	(672)
Amortization of prior service beneft and net loss	252	251
Net periodic pension cost	69	2
Amortization of prior service benefit and net loss	(252)	(251)
Net loss	742	253
Total recognized in other comprehensive loss	490	2
Total recognized in net periodic benefit and other comprehensive loss	$ 559	$ 4