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Note 5 - Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total before income tax $ (39,378) $ (36,482) $ (37,266)
Income tax 12,823 11,599 12,157
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Recognized actuarial loss [1] 1,093 1,402 1,581
Total before income tax 5,124 1,402 5,364
Income tax (1,670) (446) (1,749)
Net of income tax 3,454 956 3,615
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]      
Settlement loss [2] 2,628 2,584
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] $ 1,403 $ 1,199
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note 7, Pensions and Other Postretirement Benefits.
[2] This portion of the settlement loss is included in cost of products sold in the Consolidated Statements of Income.
[3] This portion of the settlement loss is included in selling, general and administrative expenses in the Consolidated Statements of Income.