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Note 8 - Common Stock - Outstanding Stock Purchase Warrants (Details) | Sep. 30, 2015 $ / shares shares
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Series D Warrants [Member] | Placement Agent for Offering [Member] |  |
Class of Warrant or Right, Outstanding | shares | 1,333,333 | [1]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.17 | [1]
Series D Warrants [Member] |  |
Class of Warrant or Right, Outstanding | shares | 16,666,666 | [1]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.17 | [1]
Series E Warrants [Member] |  |
Class of Warrant or Right, Outstanding | shares | 16,666,666 | [1]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.14 | [1]
Series F Warrants [Members] |  |
Class of Warrant or Right, Outstanding | shares | 16,666,666 | [1]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.17 | [1]
Class of Warrant or Right, Outstanding | shares | 56,442,157 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 0.20 |
Warrants exercisable (in shares) | shares | 39,775,491 |
Warrants exercisable, weighted-average exercise price (in dollars per share) | $ / shares | $ 0.21 |
[1] | See discussion under "Series C Convertible Preferred Stock" in Note 7.

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