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Consolidated Statements of Stockholders' Equity (Parentheticals) - shares | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 26, 2017 | Apr. 01, 2017 | Feb. 25, 2017 | Dec. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 240,933 | 4,490 | 173,288 | 900,997 | 283,343 | 82,100 | 1,319,708 | 283,343 | 82,100 | 1,685,151

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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