Annual report pursuant to Section 13 and 15(d)

Note 11 - Stock-based Compensation - Stock Option Transactions (Details)

v3.20.1
Note 11 - Stock-based Compensation - Stock Option Transactions (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Outstanding (in shares) 4,489 2,344
Outstanding, weighted average exercise price (in dollars per share) $ 3.11 $ 3.46
Granted (in shares) 2,160 2,320
Granted, weighted average exercise price (in dollars per share) $ 2 $ 2.98
Exercised (in shares) (312) (114)
Exercised, weighted average exercise price (in dollars per share) $ 2.32 $ 2.04
Expired (in shares) (67) (51)
Expired, weighted average exercise price (in dollars per share) $ 4.61 $ 2.34
Forfeited (in shares) (329) (10)
Forfeited, weighted average exercise price (in dollars per share) $ 2.36 $ 4.97
Outstanding (in shares) 5,941 4,489
Outstanding, weighted average exercise price (in dollars per share) $ 2.84 $ 3.11
Outstanding, weighted average remaining contractual life (Year) 7 years 219 days  
Outstanding, aggregate intrinsic value $ 16,866,623  
Exercisable (in shares) 3,057  
Exercisable, weighted average exercise price (in dollars per share) $ 3.44  
Exercisable, weighted average remaining contractual life (Year) 6 years 182 days  
Exercisable, aggregate intrinsic value $ 6,853,978  
Vested and expected to vest (in shares) 5,508  
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 2.89  
Vested and expected to vest, weighted average remaining contractual life (Year) 7 years 182 days  
Vested and expected to vest, aggregate intrinsic value $ 15,364,726