Note 7 - Other Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability, Defined Benefit Plan, Noncurrent	$ 18,431	$ 19,876
Cash Surrender Value, Fair Value Disclosure	16,400	15,100
Increase (Decrease) in Cash Surrender Value	1,300	1,300	$ (2,200)
Investments Held in Rabbi Trust [Member]
Debt Securities, Available-for-Sale, Amortized Cost	600	300
Debt Securities, Available-for-Sale	600	300
Supplemental Employee Retirement Plan [Member]
Liability, Defined Benefit Plan, Noncurrent	18,000	19,500
Investments, Fair Value Disclosure	$ 17,000	$ 15,400