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Note 12 - Pension and Other Postretirement Benefit Plans - Amounts in Accumulated Other Comprehensive Income to be Recognized as Components of Net Periodic Expense (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Net Actuarial loss (gain) | $ 563
Prior Service cost (credit) | (73)
Total | 490
Retirement Plan [Member] |
Net Actuarial loss (gain) | 621
Prior Service cost (credit) | 0
Total | 621
Other Postretirement Benefits Plan [Member] |
Net Actuarial loss (gain) | 33
Prior Service cost (credit) | (85)
Total | (52)
Directors' Plan [Member] |
Net Actuarial loss (gain) | (91)
Prior Service cost (credit) | 12
Total | $ (79)

X
- Definition Amount, after tax, of accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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Period Type: | instant

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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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