Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Obligation, Pension Benefits	$ 1,000	$ 7,000	$ (20,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	8,000	23,000	(0)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(2,000)	(5,000)	5,000
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	2,000	5,000	(5,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total	1,000	(6,000)	(15,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Total			(5,000)
Income Taxes Paid, Net	135,000	50,000	180,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	$ 0	$ 0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 252,000