Note 18 - Post-retirement Benefits (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 1,200	$ 900	$ 2,500	$ 1,800
Deferred Compensation Liability, Current and Noncurrent, Total	7,234		7,234		$ 9,339
Cash Surrender Value of Life Insurance	10,199		$ 10,199		$ 18,857
Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)			5 years
Deferred Compensation Liability, Current and Noncurrent, Total	7,200		$ 7,200
Cash Surrender Value of Life Insurance	$ 10,200		$ 10,200