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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