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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
--- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Retained Earnings [Member] |  |  |  |  |  |
Common cash dividends declared (in dollars per share) | $ 0.05 | $ 0.05 | $ 0.05 |  |  |
Common Stock [Member] |  |  |  |  |  |
Common cash dividends declared (in dollars per share) |  |  |  | $ 0.04 | $ 0.04 | $ 0.04
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan, shares (in shares) | 2,319 | 4,582 | 3,573 | 4,085 | 6,982 | 5,054
Proceeds from issuance of common stock, stock options exercised, shares (in shares) | 19,906 | 8,027 | 44,284 | 14,692 | 20,975 | 46,020
Restricted stock awards - common stock, shares (in shares) | 4,500 | 2,000 | 13,289 |  | 500 | 22,382
Exchange of common stock, shares (in shares) |  | 594 | 6,772 | 838 |  | 19,628
Proceeds from issuance of common stock, net of issuance costs, shares (in shares) |  |  |  |  | 1,215,000 |
Common cash dividends declared (in dollars per share) | $ 0.05 |  |  | $ 0.04 |  |

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