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Note 6 - Stockholders' Equity (Details) - Stock Purchase Warrant Transactions (USD $) | 9 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Series A Warrants [Member] | May 14, 2013 Series B Warrants [Member] | Jan. 17, 2013 Series B Warrants [Member] | Jan. 31, 2013 Series B Warrants [Member] | Dec. 31, 2012 Series B Warrants [Member] | Dec. 31, 2012 Series C Warrants [Member] | Dec. 31, 2012 Other Warrants [Member]
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding (in Shares) | 8,292,226 | 11,225,559 | 1,870,559 |  |  |  | 1,166,667 |  |  |  |  |  |  |
Outstanding (in Dollars per share) | $ 2.53 | $ 2.06 | $ 7.96 |  |  |  |  |  |  |  |  |  |  |
Exercisable at December 31, 2012 (in Shares) | 8,292,226 | 8,290,376 |  |  |  |  |  |  |  |  |  |  |  |
Exercisable at December 31, 2012 | $ 2.53 | $ 2.44 |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares (in Dollars) |  |  |  | $ 2,933,333 | [1] |  |  |  | $ 2,933,333 | [1] | $ 2,933,333 | [1] | $ 612,001 | [2]
Weighted Average Exercise Price |  |  |  | $ 1.00 | [1] |  |  |  | $ 0.75 | [1] | $ 1.00 | [1] | $ 1.00 | [2]
Exercised (in Shares) | (2,933,333) | 0 |  |  |  | 1,166,666 | 1,766,667 | 1,766,667 |  |  |  |  |  |
Exercised | $ 0.56 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Forfeited or expired (in Shares) |  | (57,000) |  |  |  |  |  |  |  |  |  |  |  |
Forfeited or expired |  | $ 7.00 |  |  |  |  |  |  |  |  |  |  |  |
[1] | See discussion under "Series A Convertible Preferred Stock" above.
[2] | See discussion under "Common Stock Transactions" above.

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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