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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Total before income tax $ (11,807) $ (9,632) $ (19,127) $ (18,891)
Income tax 3,959 3,012 6,214 5,989
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss (a) [1] 290 351 612 702
Total before income tax 2,003 351 4,005 702
Income tax (723) (119) (1,449) (220)
Net of income tax 1,280 232 2,556 482
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]        
Settlement loss [2] 1,130 2,188
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] $ 583 $ 1,205
[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.