Note 12 - Pension and Other Postretirement Benefit Plans - The Resulting Net Periodic Postretirement Expense Consisted of the Following Components for the Year (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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Service cost | $ 316 | $ 359 | $ 382 |
Interest cost | 305 | 320 | 300 |
Amortization of unrecognized loss | 47 | 119 | |
Amortization of past service credit | (85) | (85) | (85) |
Net pension expense | 536 | 641 | 716 |
Current year actuarial (gain) loss | 587 | (613) | (715) |
Amortization of actuarial loss | (47) | (119) | |
Amortization of prior service credit | (85) | (85) | (85) |
Total recognized in other comprehensive income | 672 | (575) | (749) |
Total recognized in net pension cost (benefit) and other comprehensive loss | $ 1,208 | $ 66 | $ (33) |
X | ||||||||||
- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Details
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