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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Total before income tax $ (7,957) $ (10,402) $ (27,084) $ (29,293)
Income tax 2,255 3,475 8,469 9,464
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss (a) [1] 267 351 879 1,053
Total before income tax 715 351 4,720 1,053
Income tax (243) (123) (1,692) (343)
Net of income tax 472 228 3,028 710
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]        
Settlement loss [2] 305 2,493
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] $ 143 $ 1,348
[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 is included in selling, general & administrative expenses on the condensed consolidated statements of income.