Note 9 - Components of Net Periodic Pension Cost - Net Periodic Pension Cost (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	78	71	156	142
Expected return on plan assets	(237)	(213)	(474)	(426)
Net amortization	16	75	32	150
Total periodic pension income	$ (143)	$ (67)	$ (286)	$ (134)