Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Share-based Compensation - Stock Options Outstanding (Details)

v3.19.2
Note 13 - Share-based Compensation - Stock Options Outstanding (Details)
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Outstanding, shares (in shares) | shares 1,249,559
Outstanding, weighted average remaining contractual life (Year) 8 years 292 days
Outstanding, weighted average exercise price (in dollars per share) $ 5.41
Exercisable, shares (in shares) | shares 408,784
Exercisable, weighted average remaining contractual life (Year) 6 years 328 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 132,900
Outstanding, weighted average remaining contractual life (Year) 6 years 182 days
Outstanding, weighted average exercise price (in dollars per share) $ 2.32
Exercisable, shares (in shares) | shares 131,650
Exercisable, weighted average remaining contractual life (Year) 6 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 122,905
Outstanding, weighted average remaining contractual life (Year) 7 years 182 days
Outstanding, weighted average exercise price (in dollars per share) $ 3.95
Exercisable, shares (in shares) | shares 103,530
Exercisable, weighted average remaining contractual life (Year) 7 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 761,804
Outstanding, weighted average remaining contractual life (Year) 9 years 255 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.60
Exercisable, shares (in shares) | shares 64,104
Exercisable, weighted average remaining contractual life (Year) 8 years 36 days
Exercise Price Range 4 [Member]  
Per share exercise price, lower range (in dollars per share) $ 7
Per share exercise price, upper range (in dollars per share) $ 26
Outstanding, shares (in shares) | shares 231,950
Outstanding, weighted average remaining contractual life (Year) 7 years 255 days
Outstanding, weighted average exercise price (in dollars per share) $ 10.62
Exercisable, shares (in shares) | shares 109,500
Exercisable, weighted average remaining contractual life (Year) 6 years 109 days