Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Share-based Compensation - Stock Options Outstanding (Details)

v3.20.2
Note 12 - Share-based Compensation - Stock Options Outstanding (Details)
 6 Months Ended
Jun. 30, 2020
$ / shares
shares
Outstanding, shares (in shares) | shares 1,413,988
Outstanding, weighted average remaining contractual life (Year) 8 years 36 days
Outstanding, weighted average exercise price (in dollars per share) $ 5.19
Exercisable, shares (in shares) | shares 785,972
Exercisable, weighted average remaining contractual life (Year) 7 years 109 days
Exercise Price Range 1 [Member]  
Per share exercise price, lower range (in dollars per share) $ 2
Per share exercise price, upper range (in dollars per share) $ 2.99
Outstanding, shares (in shares) | shares 125,700
Outstanding, weighted average remaining contractual life (Year) 5 years 182 days
Outstanding, weighted average exercise price (in dollars per share) $ 2.24
Exercisable, shares (in shares) | shares 125,700
Exercisable, weighted average remaining contractual life (Year) 5 years 182 days
Exercise Price Range 2 [Member]  
Per share exercise price, lower range (in dollars per share) $ 3
Per share exercise price, upper range (in dollars per share) $ 3.99
Outstanding, shares (in shares) | shares 98,572
Outstanding, weighted average remaining contractual life (Year) 6 years 182 days
Outstanding, weighted average exercise price (in dollars per share) $ 3.81
Exercisable, shares (in shares) | shares 98,572
Exercisable, weighted average remaining contractual life (Year) 6 years 182 days
Exercise Price Range 3 [Member]  
Per share exercise price, lower range (in dollars per share) $ 4
Per share exercise price, upper range (in dollars per share) $ 4.99
Outstanding, shares (in shares) | shares 951,791
Outstanding, weighted average remaining contractual life (Year) 9 years
Outstanding, weighted average exercise price (in dollars per share) $ 4.56
Exercisable, shares (in shares) | shares 399,541
Exercisable, weighted average remaining contractual life (Year) 8 years 182 days
Exercise Price Range 4 [Member]  
Per share exercise price, lower range (in dollars per share) $ 5
Per share exercise price, upper range (in dollars per share) $ 10
Outstanding, shares (in shares) | shares 187,775
Outstanding, weighted average remaining contractual life (Year) 7 years 146 days
Outstanding, weighted average exercise price (in dollars per share) $ 7.35
Exercisable, shares (in shares) | shares 112,009
Exercisable, weighted average remaining contractual life (Year) 7 years 219 days
Exercise Price Range 5 [Member]  
Per share exercise price, lower range (in dollars per share) $ 10.01
Per share exercise price, upper range (in dollars per share) $ 34
Outstanding, shares (in shares) | shares 50,150
Outstanding, weighted average remaining contractual life (Year) 2 years 146 days
Outstanding, weighted average exercise price (in dollars per share) $ 17.81
Exercisable, shares (in shares) | shares 50,150
Exercisable, weighted average remaining contractual life (Year) 2 years 146 days