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Note 6 - Fair Value Assumption (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Minimum [Member]      
Risk free interest rate 1.01% 1.66%  
Expected volatility 85.00%    
Maximum [Member]      
Risk free interest rate 2.43% 2.43%  
Expected volatility 129.00%    
Expected dividend yield 0.00% 0.00% 0.00%
Risk free interest rate     2.30%
Expected life in years 5 years 10 years 10 years
Expected volatility   85.00% 85.00%