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, 2021	Dec. 31, 2020
Interest cost	$ 338	$ 395
Expected return on plan assets	(720)	(699)
Amortization of prior service beneft and net loss	292	268
Net periodic pension cost	(90)	(36)
Amortization of prior service benefit and net loss	(292)	(268)
Net (gain) loss	(509)	871
Total recognized in other comprehensive (income) loss	(801)	603
Total recognized in net periodic benefit and other comprehensive (income) loss	$ (891)	$ 567