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Note 8 - Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest cost on projected benefit obligation $ 508 $ 863  
Service cost - benefits earned during the period 185 152  
Pension Plan [Member]      
Interest cost on projected benefit obligation 171 541 $ 721
Expected return on plan assets (597) (1,555) (1,491)
Recognized actuarial loss 376 539 643
Settlement loss 0 413 1,110
Pension plan termination charge 7,821 0 0
Net periodic pension cost after settlements 7,771 (62) 983
Service cost - benefits earned during the period 0 0  
Supplemental Employee Retirement Plan [Member]      
Interest cost on projected benefit obligation 337 322 363
Recognized actuarial loss 1,499 695 616
Net periodic pension cost after settlements 2,021 1,169 1,096
Service cost - benefits earned during the period $ 185 $ 152 $ 117