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Note 7 - Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2013
Mar. 31, 2012
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2015
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   71       0 71    
Preferred Stock, Shares Authorized     2,200            
Preferred Stock, Par or Stated Value Per Share   $ 1,000 $ 1,000     $ 1,000 $ 1,000    
Convertible Preferred Stock, Total Conversion Shares     2,933,333            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     8,799,999            
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     0 71 71 717 1,412  
Common stock conversion (in shares) 202,857         202,857 2,048,570 1,882,667  
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 1,650    
Preferred Stock, Par or Stated Value Per Share   $ 1,000   $ 1,000   $ 1,000 $ 1,000    
Convertible Preferred Stock, Total Conversion Shares   4,714,286   285,714   285,714 4,714,286    
Proceeds from Issuance of Convertible Preferred Stock   $ 1,600              
Convertible Preferred Stock, Conversion Price Per Share           $ 0.35      
Convertible preferred stock (in shares)       0 420 1,550      
Common stock conversion (in shares)           4,428,571 0 0  
Stock Issued During Period, Shares, New Issues   1,650              
Preferred Stock, Shares Authorized   10,000,000   10,000,000   10,000,000 10,000,000    
Preferred Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01   $ 0.01 $ 0.01    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                 49,999,998