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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Stockholders' Equity [Abstract] |  |  |
Shares of common stock issued under compensation plans | 738,326 | 1,038,142 | 1,329,957
Dividends on common stock, per share amount | $ 0.30 | $ 0.28 | $ 0.26

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