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Note 9 - Employee Retirement Plans - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Service cost $ 112 $ 427 $ 294
Interest cost 2,907 3,751 3,605
Administrational expenses 49 68 36
Pension Plan And Supplemental Plan [Member]      
Service cost 109 427 294
Interest cost 2,907 3,751 3,605
Expected return on plan assets (2,191) (2,375) (2,042)
Administrational expenses 49 71 36
Payroll tax of net pension costs 14 55 42
Amortization of net actuarial losses (5) (592) 30
Recognized actuarial loss 0 0 0
Settlement/Curtailment (gain) loss 738 (219) 335
Net periodic pension cost $ 1,621 $ 1,118 $ 2,300