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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parentheticals)	6 Months Ended
	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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Aggregate dividends paid during the period for each share of common stock outstanding.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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