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Note 4 - Debt Obligations - Pricing Supplements (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Jan. 31, 2015
Pricing Supplement No.1 [Member] | The 2015 Unit Offering [Member]      
Conversion Price (in dollars per share) $ 0.25    
Warrant Exercise Price (in dollars per share) $ 0.40    
Aggregate Investments $ 460,000    
Pricing Supplement No.2 [Member] | The 2015 Unit Offering [Member]      
Conversion Price (in dollars per share) $ 0.25    
Warrant Exercise Price (in dollars per share) $ 0.40    
Aggregate Investments $ 1,100,000    
Pricing Supplement No.3 [Member] | The 2015 Unit Offering [Member]      
Conversion Price (in dollars per share) $ 0.35    
Warrant Exercise Price (in dollars per share) $ 0.45    
Aggregate Investments $ 1,546,713    
Pricing Supplement No.4 [Member] | The 2015 Unit Offering [Member]      
Conversion Price (in dollars per share) $ 0.35    
Warrant Exercise Price (in dollars per share) $ 0.45    
Aggregate Investments $ 550,000    
Pricing Supplement No.5 [Member] | The 2015 Unit Offering [Member]      
Conversion Price (in dollars per share) $ 0.55    
Warrant Exercise Price (in dollars per share) $ 0.70    
Aggregate Investments $ 1,155,000    
The 2015 Unit Offering [Member]      
Warrant Exercise Price (in dollars per share)     $ 0.30
Aggregate Investments 4,811,713    
Aggregate Investments $ 5,117,876 $ 3,245,972