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Note 6 - Stockholders' Equity - Fair Value Assumption (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Exercise price (in dollars per share)  
Expected dividend yield 0.00% 0.00%
Expected life in years (Year)   5 years
Minimum [Member]    
Exercise price (in dollars per share) $ 1 $ 0.26
Risk free interest rate 1.93% 1.01%
Expected life in years (Year) 4 years 219 days  
Expected volatility 210.00% 85.00%
Maximum [Member]    
Exercise price (in dollars per share) $ 1.25 $ 1.25
Risk free interest rate 2.40% 2.43%
Expected life in years (Year) 9 years 303 days  
Expected volatility 266.00% 213.00%