XML 56 R45.htm IDEA: XBRL DOCUMENT v3.20.2
Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Unvested, number of options (in shares) 2,008,000  
Unvested, weighted average exercise price per share (in dollars per share) $ 4.72  
Unvested, weighted average remaining contractual term (Year) 8 years 7 months 6 days 9 years 1 month 6 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 3 months 18 days  
Forfeited, number of options (in shares) (59,000)  
Forfeited, weighted average exercise price per share (in dollars per share)  
Vested, number of options (in shares) (1,004,000)  
Vested, weighted average exercise price per share (in dollars per share) $ 4.72  
Vested, weighted average remaining contractual term (Year) 8 years 3 months 18 days  
Unvested, number of options (in shares) 1,423,000 2,008,000
Unvested, weighted average exercise price per share (in dollars per share) $ 4.04 $ 4.72