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Note 5 - Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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