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Consolidated Statements Of Stockholders' Equity (Parentheticals) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Purchase of common shares for treasury (shares) | 0 | 5,000 | 80,512
Common shares issued, net shares withheld for taxes | 27,951 | 96,916 | 59,113

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