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Note 10 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Outstanding, number of options (in shares) 112,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 13.98  
Outstanding, weighted average remaining contractual term (Year) 9 years 2 years 292 days
Granted, number of options (in shares) 2,064,000  
Granted, weighted average exercise price per share (in dollars per share) $ 4.72  
Granted, weighted average remaining contractual term (Year) 9 years 109 days  
Forfeited, number of options (in shares) (56,000)  
Forfeited, weighted average exercise price per share (in dollars per share) $ 4.72  
Outstanding, number of options (in shares) 2,120,000 112,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 5.21 $ 13.98
Outstanding, aggregate intrinsic value  
Options exercisable, number of options (in shares) 112,000  
Options exercisable, weighted average exercise price per share (in dollars per share) $ 13.98  
Options exercisable, weighted average remaining contractual term (Year) 2 years 36 days  
Options exercisable, aggregate intrinsic value