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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
Common Stock [Member] |  |  |  |  |  |
Common cash dividends declared, dividends per share (in dollars per share) | $ 0.04 | $ 0.04 | $ 0.04 |  | $ 0.04 |
Proceeds from issuance of common stock, Employee Stock Purchase Plan, shares (in shares) | 4,085 | 6,982 | 5,054 | 5,394 | 8,558 | 5,679
Proceeds from issuance of common stock, stock options exercised, shares (in shares) | 14,692 | 20,975 | 46,020 | 24,711 | 17,240 | 9,688
Exchange of common stock, stock options exercised, shares (in shares) | 838 |  | 15,689 |  | 630 |
Exchange of common stock, restricted stock vested, shares (in shares) |  |  | 3,939 |  |  | 3,272
Stock Issued During Period, Shares, New Issues |  | 1,215,000 |  |  | 3,680,000 |
Retirement of treasury stock, shares (in shares) |  |  |  | 121,246 |  |
Common cash dividends declared, dividends per share (in dollars per share) | $ 0.04 |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 1,215,000 |  |  |  |

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