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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Retained Earnings [Member] |  |
Cash dividends declared per common share (in dollars per share) | $ 0.06 | $ 0.05
Common Stock [Member] |  |
Issuance of shares as a result of stock purchased under the Employee Stock Purchase Plan (in shares) | 2,669 | 3,573
Issuance of shares of common stock as a result of stock options exercised (in shares) | 13,074 | 44,284
Restricted stock awards (in shares) | 6,860 | 13,289
Exchange of shares of common stock in conncection with stock options exercised and restricted stock vested (in shares) | 3,814 | 6,772
Cash dividends declared per common share (in dollars per share) | $ 0.06 | $ 0.05

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