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

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