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Note 6 - Warrants - Assumptions Used to Determine Fair Value of Warrants (Details)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Expected life in years (Year) 5 years 5 years
Minimum [Member]    
Risk free interest rate 1.71% 0.95%
Expected volatility 293.00% 311.00%
Maximum [Member]    
Risk free interest rate 1.93% 1.36%
Expected volatility 297.00% 315.00%