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Note 13 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Outstanding, number of options (in shares) 112,000 222,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 13.98 $ 12.59  
Outstanding, weighted average remaining contractual term (Year) 8 years 255 days 2 years 292 days 5 years 146 days
Expired, number of options (in shares)   (110,000)  
Expired, weighted average exercise price per share (in dollars per share)   $ 11.17  
Outstanding, aggregate intrinsic value  
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 36 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) 2,120,000 112,000 222,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 5.21 $ 13.98 $ 12.59
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) 1 year 292 days    
Options exercisable, aggregate intrinsic value