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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Treasury Stock [Member] |  |
Purchase of treasury shares (in shares) | 1,051 | 416
Additional Paid-in Capital [Member] |  |
Issuance of common stock in acquisition (in shares) |  | 580,017

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