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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement Of Stockholders' Equity [Abstract] |  |  |
Issuance of common stock to non-employee directors, shares | 4,410 | 4,620 | 5,154
Exercise of stock options, shares | 500 | 34,000 | 31,697
Dividends paid, per share (in dollars per share) | $ 0.68 | $ 0.64 | $ 0.60

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