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Note 12 - Preferred Stock (Details Textual) | Mar. 18, 2009 $ / shares shares | Dec. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares
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Preferred Stock Dividends Number of Preferred Share Purchase Rights Distributed for each Share of Common Stock Outstanding | 1 |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 | $ 0.01
Preferred Share Purchase Right [Member] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 25 |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares | 0.001 |  |
Series A Junior Participating Preferred Stock [Member] |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 |  |

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- Definition Represents the number of preferred share purchase rights declared as dividend for each outstanding share of common stock on March, 2009. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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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 Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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