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Note 10 - Amendment to Amended and Restated Certificate of Incorporation (Details Textual) - $ / shares | Dec. 31, 2017 | Jul. 07, 2017 | Dec. 31, 2016 | May 31, 2015 | Apr. 30, 2015
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Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01
Common Stock, Shares Authorized | 96,000,000 |  | 96,000,000 | 96,000,000 | 48,000,000

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- Definition Face amount or stated value per share of common stock. + References Reference 1: 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 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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 + Details
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