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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent [Member] |  |  |
Other comprehensive income (loss), tax | $ 369 | $ 402 | $ 1,218
Retained Earnings [Member] |  |  |
Cash dividend, per share (in dollars per share) | $ 1.17 | $ 1.16 | $ 1.14
Other comprehensive income (loss), tax | $ 369 | $ (402) | $ (1,218)

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