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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Issuance of common stock to non-employee directors (in shares) | 5,366 | 5,556 | 5,814
Dividends paid (in dollars per share) | $ 0.72 | $ 0.72 | $ 0.72
Stock Options |  |  |
Exercise of stock options (in shares) | 0 | 0 | 10,250

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