Note 8 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash			$ (1,807)	$ 0
Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		$ 11,800
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash	$ (1,800)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer			800	$ 800
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	800		800
Defined Benefit Plan, Benefit Obligation	$ 17,200		$ 17,200		$ 17,300