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Note 7 - Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Settlement loss $ 1,900   $ 3,400  
Pension Plan [Member]        
Service cost 649 $ 659 1,398 $ 1,342
Interest cost 394 555 785 1,091
Expected return on plan assets (906) (958) (1,800) (1,943)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 544 621 1,059 1,134
Settlement loss 1,728 1,904 1,728 3,382
Net periodic benefit cost (gain) [1] 2,409 2,781 3,170 5,006
Postemployment Retirement Benefits [Member]        
Service cost 365 343 731 686
Interest cost 163 194 327 389
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (282) (282) (565) (564)
Recognized actuarial loss 145 77 290 153
Settlement loss 0 0 0 0
Net periodic benefit cost (gain) [1] $ 391 $ 332 $ 783 $ 664
[1] The components of net periodic benefit cost other than the service cost component are included in Other income (expense), net in the Consolidated Statements of Income.