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Note 7 - Accumulated Other Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Total before income tax $ (7,320) $ (9,259)
Income tax 2,255 2,977
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Recognized actuarial loss (a) [1] 322 351
Total before income tax 2,002 351
Income tax (726) (101)
Net of income tax 1,276 250
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]    
Settlement loss [2] 1,058
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Selling, General and Administrative Expenses [Member]    
Settlement loss [3] $ 622
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note 6 for additional details.
[2] This portion of the settlement loss is included in cost of products sold on the condensed consolidated statements of income.
[3] This portion of the settlement loss in included in selling, general & administrative expenses on the condensed consolidated statements of income.