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Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Common Stock [Member] |  |
Common stock, offering cost |  | $ 760
Retained Earnings [Member] |  |
Cash dividends per share (in dollars per share) | $ 1.17 | $ 1.08
Cash dividends per share (in dollars per share) | $ 1.17 | $ 1.08

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