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Note 7 - Preferred Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Dec. 31, 2013 | Sep. 30, 2015 | Apr. 08, 2015 | Mar. 20, 2015 | Dec. 31, 2014 | May. 14, 2013 | Apr. 30, 2013 | Jan. 17, 2013 | Dec. 31, 2012
Series B Convertible Preferred Stock [Member] | Gross Proceeds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 1,650 |  |  |  |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 1,650 | 100 |  |  |  | 100 |  |  |  |
Preferred Stock, Shares Issued |  |  | 1,650 | 100 |  |  |  | 100 |  |  |  |
Convertible Preferred Stock, Total Conversion Shares |  |  | 4,714,286 | 285,714 |  |  |  | 285,714 |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 1,000 | $ 1,000 |  |  |  | $ 1,000 |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 1,600 |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share |  |  |  |  |  |  |  | $ 0.35 |  |  |  |
Series C Convertible Preferred Stock [Member] | Gross Proceeds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  | $ 3,000 |  |  |  |  |  |  |  |  |  |
Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  | 3,000 |  |  |  | 0 |  |  |  |
Preferred Stock, Voting Rights |  | no |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 3,000 |  | 3,000 |  |  |  | 0 |  |  |  |
Convertible Preferred Stock, Total Conversion Shares |  |  |  |  |  | 21,126,760 |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 1,000 |  | $ 1,000 |  |  |  | $ 1,000 |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  | $ 2,700 |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share |  | $ 0.18 |  |  |  | $ 0.142 | $ 0.142 |  |  |  |  |
Series D Warrants [Member] | Placement Agent for Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 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, Number of Securities Called by Warrants or Rights |  | 16,666,666 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.22 |  | 0.17 | [1] |  |  |  |  |  |  |
Warrant Term |  | 5 years |  |  |  |  |  |  |  |  |  |
Series E Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.18 |  | 0.14 | [1] |  | 0.142 |  |  |  |  |
Warrant Term |  | 1 year |  |  |  |  |  |  |  |  |  |
Series F Warrants [Members] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.22 |  | 0.17 | [1] |  | $ 0.1704 |  |  |  |  |
Warrant Term |  | 5 years |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 | 0.01 |  |  |  | 0.01 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 49,999,998 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 0.20 |  |  |  | $ 0.66 | $ 0.50 | $ 0.60 | $ 0.60 | $ 0.75
[1] | See discussion under "Series C Convertible Preferred Stock" in Note 7.

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