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Note 9 - Share Based Payments - Weighted-average Assumptions Used in Calculations of Fair Value (Details)
12 Months Ended
Dec. 31, 2018
Dividend yield 0.00%
Black-Scholes-Merton [Member]  
Volatility 174.00%
Expected life of options (in years) (Year) 5 years
Risk-free interest rate 2.50%
Dividend yield 0.00%