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Note 6 - Summary of Warrants Issued and Outstanding (Details) | 12 Months Ended
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Dec. 31, 2015 $ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1
Expires on January 1, 2017 [Member] |
Remaining Contractual Life (Year) | 1 year 73 days
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.25
Expires on July 7, 2021 [Member] |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1
Expires on July 7, 2021 [Member] | Minimum [Member] |
Remaining Contractual Life (Year) | 5 years 182 days
Expires on July 7, 2021 [Member] | Maximum [Member] |
Remaining Contractual Life (Year) | 6 years 255 days
Expires on December 20, 2023 [Member] |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.05
Expires on December 20, 2023 [Member] | Minimum [Member] |
Remaining Contractual Life (Year) | 7 years 109 days
Expires on December 20, 2023 [Member] | Maximum [Member] |
Remaining Contractual Life (Year) | 8 years 36 days

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- Definition Weighted average remaining contractual term for warrants or rights. + 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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