Note 4 - Periodic Pension Expense - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension plan termination charge	$ 0	$ 6,945	$ 0	$ 6,945
Pension Plan [Member]
Service cost - benefits earned during the period	51	46	102	92
Interest cost on projected benefit obligation	100	153	200	340
Expected return on plan assets	0	(239)	0	(597)
Recognized actuarial loss	428	526	856	1,126
Net periodic pension cost	$ 579	$ 7,431	$ 1,158	$ 7,906