Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Share-based Compensation - Stock Options Outstanding (Details)

v3.21.1
Note 11 - Share-based Compensation - Stock Options Outstanding (Details)
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
Outstanding, shares (in shares) | shares 1,421,094
Outstanding, weighted average remaining contractual life (Year) 7 years 182 days
Outstanding, weighted average exercise price (in dollars per share) $ 5.60
Exercisable, shares (in shares) | shares 1,067,190
Exercisable, weighted average remaining contractual life (Year) 7 years
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 120,500
Outstanding, weighted average remaining contractual life (Year) 4 years 255 days
Outstanding, weighted average exercise price (in dollars per share) $ 2.41
Exercisable, shares (in shares) | shares 120,500
Exercisable, weighted average remaining contractual life (Year) 4 years 255 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 17,500
Outstanding, weighted average remaining contractual life (Year) 6 years
Outstanding, weighted average exercise price (in dollars per share) $ 3.84
Exercisable, shares (in shares) | shares 17,500
Exercisable, weighted average remaining contractual life (Year) 6 years
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 938,567
Outstanding, weighted average remaining contractual life (Year) 8 years 73 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.51
Exercisable, shares (in shares) | shares 680,974
Exercisable, weighted average remaining contractual life (Year) 7 years 328 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) $ 9.99
Outstanding, shares (in shares) | shares 274,527
Outstanding, weighted average remaining contractual life (Year) 7 years 146 days
Outstanding, weighted average exercise price (in dollars per share) $ 8.03
Exercisable, shares (in shares) | shares 198,216
Exercisable, weighted average remaining contractual life (Year) 6 years 255 days
Exercise Price Range 5 [Member]  
Per share exercise price, lower range (in dollars per share) $ 10
Per share exercise price, upper range (in dollars per share) $ 27.06
Outstanding, shares (in shares) | shares 70,000
Outstanding, weighted average remaining contractual life (Year) 4 years
Outstanding, weighted average exercise price (in dollars per share) $ 16.62
Exercisable, shares (in shares) | shares 50,000
Exercisable, weighted average remaining contractual life (Year) 1 year 219 days