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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 3 Months Ended
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Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Cash dividends declared per common share (in dollars per share) | $ 0.06 |  | $ 0.05 |
Common Stock [Member] |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.05
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares) | 5,728 | 2,669 | 4,582 | 3,573
Issuance of shares of common stock as s result of stock options exercised (in shares) | 26,641 | 13,074 | 8,027 | 44,284
Restricted stock awards (in shares) | 3,972 | 6,860 | 2,000 | 13,289
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares) | 642 | 3,814 | 594 | 6,772

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