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Note 7 - Preferred Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Jan. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 04, 2015 | Apr. 08, 2015 | May. 14, 2013 | Apr. 30, 2013 | Jan. 17, 2013
Series A Convertible Preferred Stock [Member] | Gross Proceeds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 2,200 |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] | Conversion Price Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 788 |  |  |  | 788 |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share |  |  | $ 0.35 |  |  |  | $ 0.35 |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  | 0 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 8,799,999 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  | 2,200 |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share |  |  | $ 0.35 | $ 0.75 |  |  | $ 0.35 |  |  |  |  |  |
Convertible preferred stock (in shares) |  | 71 |  |  |  | 71 | 717 | 1,412 |  |  |  |  |
Common stock conversion (in shares) |  | 202,857 |  |  | 0 | 202,857 | 2,048,570 | 1,882,667 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 51,333,331 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 0.09416 | $ 0.142 |  |  |
Convertible Preferred Stock, Total Conversion Shares |  |  |  |  |  |  |  |  | 31,860,662 |  |  |  |
Preferred Stock, Shares Issued | 3,000 |  |  |  | 3,000 | 0 |  |  |  |  |  |  |
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 |  |  |  |  | 100 | 100 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 1,000 |  | $ 1,000 | $ 1,000 | $ 1,000 |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share |  |  |  |  |  | $ 0.35 |  |  |  |  |  |  |
Convertible preferred stock (in shares) |  |  |  |  |  | 1,550 |  |  |  |  |  |  |
Common stock conversion (in shares) |  |  |  |  | 0 | 4,428,571 | 0 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,650 |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Total Conversion Shares |  |  | 4,714,286 |  |  | 285,714 | 4,714,286 |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 100 | 100 |  |  |  |  |  |  |
Series E 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 | $ 0.18 |  |  |  | $ 0.09416 |  |  |  |  |  |  |  |
Warrant Term | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Series F Warrants [Members] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 0.11299 |  |  |  |  |  |  |  |
Warrant Term | 5 years |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 0.11299 |  |  |  |  |  |  |  |
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 |  |  |  | 0.11299 |  |  |  |  |  |  |  |
Warrant Term | 5 years |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 0.14 |  |  | $ 0.75 |  |  | $ 0.50 | $ 0.60 | $ 0.60
Preferred Stock, Shares Authorized |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |

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