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Note 7 - Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended
Feb. 28, 2015
Feb. 28, 2015
Jun. 30, 2015
Apr. 08, 2015
Mar. 20, 2015
Dec. 31, 2014
Series B Convertible Preferred Stock [Member]            
Conversion of Stock, Shares Converted     0      
Preferred Stock, Shares Outstanding     100     100
Convertible Preferred Stock, Total Conversion Shares     285,714      
Preferred Stock, Shares Issued     100     100
Preferred Stock, Par or Stated Value Per Share     $ 1,000     $ 1,000
Series C Convertible Preferred Stock [Member] | Gross Proceeds [Member]            
Proceeds from Issuance of Convertible Preferred Stock   $ 3.0        
Series C Convertible Preferred Stock [Member]            
Preferred Stock, Shares Outstanding     3,000     0
Preferred Stock, Shares Issued 3,000 3,000 3,000     0
Preferred Stock, Par or Stated Value Per Share $ 1,000 $ 1,000 $ 1,000     $ 1,000
Proceeds from Issuance of Convertible Preferred Stock   $ 2.7        
Convertible Preferred Stock, Conversion Price Per Share         $ 0.142  
Series F Warrants [Members]            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.22 $ 0.22 0.17 [1]   0.1704  
Warrant Term   5 years        
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 1,333,333        
Series D Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.22 $ 0.22 0.17 [1]   0.1704  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 16,666,666 16,666,666        
Warrant Term   5 years        
Series E Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.18 $ 0.18 0.14 [1]   $ 0.142  
Warrant Term   1 year        
Series C Convertible Preferred Stock [Member]            
Preferred Stock, Voting Rights 0          
Convertible Preferred Stock, Total Conversion Shares       21,126,760    
Convertible Preferred Stock, Conversion Price Per Share $ 0.18 $ 0.18   $ 0.142    
Class of Warrant or Right, Exercise Price of Warrants or Rights     0.20     0.66
Preferred Stock, Par or Stated Value Per Share     $ 0.01     $ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 49,999,998 49,999,998        
[1] See discussion under “Series C Convertible Preferred Stock” in Note 7.