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

X
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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6881521&loc=d3e23780-122690 Reference 3: 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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