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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retained Earnings [Member] |  |  |
Cash dividend declared and paid per share (in dollars per share) | $ 1.04 | $ 0.96 | $ 0.92

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