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

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