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Note 8 - Accumulated Other Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total before income tax $ (12,586) $ (11,807) $ (25,242) $ (19,127)
Income tax 2,413 3,959 5,452 6,214
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss [1] 317 290 611 612
Total before income tax 2,546 2,003 3,227 4,005
Income tax (625) (723) (796) (1,449)
Net of income tax 1,921 1,280 2,431 2,556
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]        
Settlement loss [2] $ 2,229 $ 1,713 $ 2,616 $ 3,393
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note 7 for additional details.
[2] The settlement loss is included in other income (expense), net on the consolidated statements of income.