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Note 7 - Preferred Stock (Details Textual) - Scenario, Unspecified [Domain] - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2015
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Apr. 08, 2015
Mar. 20, 2015
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]                      
Convertible preferred stock (in shares)     0 420 1,550            
Preferred Stock, Shares Outstanding   1,650 100   100            
Convertible Preferred Stock, Total Conversion Shares   4,714,286 285,714   285,714            
Preferred Stock, Shares Issued   1,650 100   100            
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, Shares Issued 3,000   3,000   0            
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             $ 0.142        
Series C Convertible Preferred Stock [Member]                      
Preferred Stock, Voting Rights no                    
Convertible Preferred Stock, Total Conversion Shares           21,126,760          
Convertible Preferred Stock, Conversion Price Per Share $ 0.18         $ 0.142          
Series D Warrants [Member] | Placement Agent for Offering [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights     0.17 [1]       0.142        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,333,333                    
Series D Warrants [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.22   0.17 [1]       0.1704        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 16,666,666                    
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                    
Class of Warrant or Right, Exercise Price of Warrants or Rights     0.20   0.66     $ 0.50 $ 0.60 $ 0.60 $ 0.75
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                    
[1] See discussion under "Series C Convertible Preferred Stock" in Note 7.