Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stockholders' Equity - Fair Value Assumptions for Stock Options (Details)

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Note 4 - Stockholders' Equity - Fair Value Assumptions for Stock Options (Details)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Annual dividend
Minimum [Member]    
Expected life (in years) (Year) 2 years 182 days 109 days
Risk free interest rate 2.70% 0.80%
Expected volatility 97.00% 62.00%
Maximum [Member]    
Expected life (in years) (Year) 5 years 109 days 5 years 182 days
Risk free interest rate 2.80% 1.90%
Expected volatility 117.00% 83.00%