Consolidated Statements of Income and Total Comprehensive Income (Parentheticals) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Amortization of net actuarial costs and prior service costs, income taxes | $ 38 | $ 49 | $ 52 |
| Net actuarial gain (loss) on pension plan income taxes | $ 46 | $ 107 | $ 4 |
| X | ||||||||||
- Definition Amount of tax (expense) benefit 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
|
| X | ||||||||||
- Definition Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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