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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement of Stockholders' Equity [Abstract] |  |  |  |
Shares of common stock issued under compensation plans | 97,225 | 152,201 | 487,511 | 567,095

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