Note 4 - Periodic Pension Expense (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) yr	Jun. 30, 2021 USD ($)
Defined Benefit Plans Number of Plans	2		2
Defined Benefit Plans Retirement Age (Year) | yr			65
Defined Benefit Plans Number Of Plans, Terminated	2		2
Defined Benefit Plan, Termination Charge | $	$ 0	$ 6,945	$ 0	$ 6,945