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Note 8 - Employee Retirement Plans - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest cost $ 2,168 $ 2,907 $ 3,751
Administrational expenses (0) 49 68
Pension Plan And Supplemental Plan [Member]      
Service cost 0 109 427
Interest cost 2,168 2,907 3,751
Expected return on plan assets (2,174) (2,191) (2,375)
Administrational expenses 0 49 71
Payroll tax of net pension costs 0 14 55
Amortization of net actuarial losses 145 (5) (592)
Settlement/curtailment (gain) loss 0 738 (219)
Net periodic pension cost $ 139 $ 1,621 $ 1,118