Note 4 - Periodic Pension Expense - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension plan termination charge	$ 0	$ 0	$ 0	$ 6,945
Pension Plan [Member]
Service cost - benefits earned during the period	51	46	153	138
Interest cost on projected benefit obligation	100	84	300	424
Expected return on plan assets	0	0	0	(597)
Recognized actuarial loss	428	375	1,284	1,501
Net periodic pension cost	$ 579	$ 505	$ 1,737	$ 8,411