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Note 7 - Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Plan [Member]        
Service cost $ 551 $ 562 $ 1,653 $ 1,857
Interest cost 614 644 1,841 1,882
Expected return on plan assets (890) (1,073) (2,671) (3,380)
Amortization of prior service cost
Recognized actuarial loss (gain) 431 388 1,294 1,206
Settlement loss 120 2,736
Net periodic benefit cost (gain) [1] 706 641 2,117 4,301
Postemployment Retirement Benefits [Member]        
Service cost 271 194 812 582
Interest cost 235 141 706 422
Expected return on plan assets
Amortization of prior service cost (282) (283) (846) (847)
Recognized actuarial loss (gain) 7 (103) 21 (310)
Settlement loss
Net periodic benefit cost (gain) [1] $ 231 $ (51) $ 693 $ (153)
[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.