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Note 8 - Common Stock - Outstanding Stock Purchase Warrants (Details) - $ / shares | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Weighted Average Exercise Price (in dollars per share) | $ 0.05 | $ 0.07 | $ 0.14
Number of Shares (in shares) | 30,656,243 | 32,751,578 | 56,442,157
Number of Shares (in shares) |  | 32,751,578 |
Weighted Average Exercise Price (in dollars per share) |  | $ 0.07 |
Warrants Expiration 2 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 1 |
Number of Shares (in shares) |  | 45,000 |
Warrants Expiration 3 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 1 |
Number of Shares (in shares) |  | 567,001 |
Warrants Expiration 4 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 0.05 |
Number of Shares (in shares) |  | 1,483,334 |
Warrants Expiration 1[Member] |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 0.05 |
Number of Shares (in shares) |  | 30,656,243 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding and exercisable. + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of warrants or rights outstanding and exercisable. + 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 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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