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Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Outstanding, number of options (in shares) 2,120,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 5.21  
Outstanding, weighted average remaining contractual term (Year) 9 years 8 years 255 days
Granted, number of options (in shares) 478,000  
Granted, weighted average exercise price per share (in dollars per share) $ 2.48  
Granted, weighted average remaining contractual term (Year) 9 years 292 days  
Expired, number of options (in shares) (30,000)  
Expired, weighted average exercise price per share (in dollars per share) $ 7.14  
Outstanding, number of options (in shares) 2,568,000 2,120,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 5.21 $ 5.21
Outstanding, aggregate intrinsic value  
Options exercisable, number of options (in shares) 1,086,000  
Options exercisable, weighted average exercise price per share (in dollars per share) $ 4.82  
Options exercisable, weighted average remaining contractual term (Year) 8 years 109 days  
Options exercisable, aggregate intrinsic value