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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.