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Note 18 - Weighted-average Assumption Used to Determine Net Post-retirement Benefit Cost (Details) - Other Postretirement Benefit Plans [Member] | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Weighted Average Assumption Used To Determine Net Postretirement Benefit Cost [Line Items] |  |  |
Effective rate for interest cost | 2.87% | 2.85% | 3.49%
Salary increase rate | 2.35% | 1.80% | 2.60%

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- Definition Defined benefit plan assumptions used calculating net periodic benefit cost effective rate for interest cost. + References No definition available. + Details
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- Definition Weighted average assumption used to determine net postretirement benefit cost. + References No definition available. + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Details
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