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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plan [Member]        
Service cost $ 659 $ 535 $ 1,342 $ 1,102
Interest cost 555 581 1,091 1,227
Expected return on plan assets (958) (836) (1,943) (1,781)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 621 472 1,134 863
Settlement loss 1,904 0 3,382 0
Net periodic benefit cost (gain) [1] 2,781 752 5,006 1,411
Postemployment Retirement Benefits [Member]        
Service cost 343 270 686 541
Interest cost 194 236 389 471
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (282) (282) (564) (564)
Recognized actuarial loss 77 7 153 14
Settlement loss 0 0 0 0
Net periodic benefit cost (gain) [1] $ 332 $ 231 $ 664 $ 462
[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.