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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parentheticals) | 6 Months Ended
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Jun. 30, 2018 $ / shares shares
Retained Earnings [Member] |
Dividend reinvestment and purchase plan, shares (in shares) | 5,902
Stock-based compensation expense, shares (in shares) | 5,560
Cash dividends, per share (in dollars per share) | $ / shares | $ 0.61
Stock options exercised, shares (in shares) | 4,500
Cash dividends, per share (in dollars per share) | $ / shares | $ 0.61

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