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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
Mar. 31, 2018
Mar. 31, 2017
Total before income tax $ (12,656) $ (7,320)
Income tax 3,039 2,255
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Recognized actuarial loss [1] 294 322
Total before income tax 681 2,002
Income tax (171) (726)
Net of income tax 510 1,276
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]    
Settlement loss [2] $ 387 $ 1,680
[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 condensed consolidated statements of income.