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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Issuance of common stock to non-employee directors | 5,814 | 5,922 | 4,410
Dividends paid (in dollars per share) | $ 0.72 | $ 0.72 | $ 0.68
Stock Options |  |  |
Exercise of stock options | 10,250 | 26,500 | 500

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