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Note 3 - Stockholders' Deficit, Stock Options and Warrants - Listing of Stock Options and Warrants (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Stock Options 2011 [Member] | Minimum [Member]        
Price, options (in dollars per share) $ 0      
Stock Options 2011 [Member] | Maximum [Member]        
Price, options (in dollars per share) $ 281.25      
Stock Options 2011 [Member]        
Shares, options (in shares) 173      
Stock Options 2012 [Member] | Minimum [Member]        
Price, options (in dollars per share) $ 131.25      
Stock Options 2012 [Member] | Maximum [Member]        
Price, options (in dollars per share) $ 150      
Stock Options 2012 [Member]        
Shares, options (in shares) 1,841      
Stock Options 2013 [Member] | Minimum [Member]        
Price, options (in dollars per share) $ 121.88      
Stock Options 2013 [Member] | Maximum [Member]        
Price, options (in dollars per share) $ 596.25      
Stock Options 2013 [Member]        
Shares, options (in shares) 1,612      
Stock Options 2014 [Member] | Minimum [Member]        
Price, options (in dollars per share) $ 162.50      
Stock Options 2014 [Member] | Maximum [Member]        
Price, options (in dollars per share) $ 468.75      
Stock Options 2014 [Member]        
Shares, options (in shares) 969      
Stock Options 2015 [Member] | Minimum [Member]        
Price, options (in dollars per share) $ 65.75      
Stock Options 2015 [Member] | Maximum [Member]        
Price, options (in dollars per share) $ 86.25      
Stock Options 2015 [Member]        
Shares, options (in shares) 4,240      
Stock Options 2016 [Member] | Minimum [Member]        
Price, options (in dollars per share) $ 2.25      
Stock Options 2016 [Member] | Maximum [Member]        
Price, options (in dollars per share) $ 5.13      
Stock Options 2016 [Member]        
Shares, options (in shares) 99,661      
Warrants 2012 [Member]        
Class of Warrant or Right, Outstanding 2,792      
Price, warrants (in dollars per share) $ 281.25      
Warrants 2013 [Member] | Minimum [Member]        
Price, warrants (in dollars per share) 93.75      
Warrants 2013 [Member] | Maximum [Member]        
Price, warrants (in dollars per share) $ 371.25      
Warrants 2013 [Member]        
Class of Warrant or Right, Outstanding 10,703      
Warrants 2014 [Member] | Minimum [Member]        
Price, warrants (in dollars per share) $ 243.75      
Warrants 2014 [Member] | Maximum [Member]        
Price, warrants (in dollars per share) $ 609.38      
Warrants 2014 [Member]        
Class of Warrant or Right, Outstanding 6,455      
Warrants 2015 [Member] | Minimum [Member]        
Price, warrants (in dollars per share) $ 0      
Warrants 2015 [Member] | Maximum [Member]        
Price, warrants (in dollars per share) $ 243.75      
Warrants 2015 [Member]        
Class of Warrant or Right, Outstanding 94,152      
Minimum [Member]        
Price, options (in dollars per share) $ 0 $ 6.8745 $ 80.015  
Price, warrants (in dollars per share) 0      
Maximum [Member]        
Price, options (in dollars per share) 596.25 $ 139.2386 $ 347.9864  
Price, warrants (in dollars per share) $ 609.38      
Shares, options (in shares) 108,498      
Class of Warrant or Right, Outstanding 114,102      
Price, warrants (in dollars per share)       $ 281.25