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Note 7 - Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Plan [Member]      
Service cost $ 2,727 $ 2,837 $ 3,064
Interest cost 2,537 2,643 2,640
Expected return on plan assets (4,697) (4,150) (4,060)
Recognized actuarial loss 1,770 2,101 2,230
Settlement loss 4,031 3,783
Net periodic benefit cost 6,368 3,431 7,657
Net (gain) loss (2,470) (2,952) 1,156
Total expense (income) recognized in net periodic benefit cost and other comprehensive income 3,898 479 8,813
Service cost 2,727 2,837 3,064
Interest cost 2,537 2,643 2,640
Recognized actuarial gain 1,770 2,101 2,230
Postretirement Plan [Member]      
Service cost 1,249 1,192 1,194
Interest cost 814 842 790
Recognized actuarial loss (677) (699) (649)
Net periodic benefit cost 1,386 1,335 1,335
Net (gain) loss (4,105) 205 (529)
Total expense (income) recognized in net periodic benefit cost and other comprehensive income (2,719) 1,540 806
Service cost 1,249 1,192 1,194
Interest cost 814 842 790
Recognized actuarial gain $ (677) $ (699) $ (649)