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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Retained Earnings [Member] |  |
Common cash dividends declared, dividends per share (in dollars per share) | $ 0.05 | $ 0.04
Common Stock [Member] |  |
Proceeds from issuance of common stock, Employee Stock Purchase Plan, shares (in shares) | 3,573 | 5,054
Proceeds from issuance of common stock, stock options exercised, shares (in shares) | 44,284 | 46,020
Restricted stock awards, shares (in shares) | 13,289 | 22,382
Exchange of common stock in connection with stock options exercised and restricted stock vested, shares (in shares) | 6,772 | 19,628
Common cash dividends declared, dividends per share (in dollars per share) | $ 0.05 | $ 0.04

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