Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Stock-based Compensation - Weighted Average Assumptions (Details)

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Note 10 - Stock-based Compensation - Weighted Average Assumptions (Details) - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Risk-free interest rate 2.21% 2.43%
Expected dividend yield
Expected volatility 83.90% 93.40%
Expected life of options (Year) 5 years 5 years
Grant date fair value (in dollars per share) $ 1.32 $ 2.23