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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Common cash dividends declared, per share (in Dollars per share) | $ 0.04 |
Common Stock [Member] |  |
Proceeds from issuance of common stock, Employee Stock Purchase Plan, Shares | 5,054 | 5,679
Proceeds from issuance of common stock, stock options exercised, shares | 30,331 | 9,688
Exchange of common stock, restricted stock vested, shares | 3,939 | 3,272

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