Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.1
Note 12 - Share-based Compensation - Stock Options Outstanding (Details)
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
Outstanding, shares (in shares) | shares 2,159,413
Outstanding, weighted average remaining contractual life (Year) 7 years 7 months 6 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.88
Exercisable, shares (in shares) | shares 1,336,428
Exercisable, weighted average remaining contractual life (Year) 6 years 6 months
Exercise Price Range 1 [Member]  
Per share exercise price, lower range (in dollars per share) $ 2.00
Per share exercise price, upper range (in dollars per share) $ 2.99
Outstanding, shares (in shares) | shares 285,500
Outstanding, weighted average remaining contractual life (Year) 7 years 3 months 18 days
Outstanding, weighted average exercise price (in dollars per share) $ 2.70
Exercisable, shares (in shares) | shares 120,500
Exercisable, weighted average remaining contractual life (Year) 3 years 8 months 12 days
Exercise Price Range 2 [Member]  
Per share exercise price, lower range (in dollars per share) $ 3.00
Per share exercise price, upper range (in dollars per share) $ 3.99
Outstanding, shares (in shares) | shares 330,508
Outstanding, weighted average remaining contractual life (Year) 8 years 9 months 18 days
Outstanding, weighted average exercise price (in dollars per share) $ 3.82
Exercisable, shares (in shares) | shares 68,647
Exercisable, weighted average remaining contractual life (Year) 6 years 8 months 12 days
Exercise Price Range 3 [Member]  
Per share exercise price, lower range (in dollars per share) $ 4.00
Per share exercise price, upper range (in dollars per share) $ 4.99
Outstanding, shares (in shares) | shares 928,150
Outstanding, weighted average remaining contractual life (Year) 7 years 2 months 12 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.51
Exercisable, shares (in shares) | shares 840,151
Exercisable, weighted average remaining contractual life (Year) 7 years 1 month 6 days
Exercise Price Range 4 [Member]  
Per share exercise price, lower range (in dollars per share) $ 5.00
Per share exercise price, upper range (in dollars per share) $ 9.99
Outstanding, shares (in shares) | shares 571,088
Outstanding, weighted average remaining contractual life (Year) 7 years 10 months 24 days
Outstanding, weighted average exercise price (in dollars per share) $ 6.47
Exercisable, shares (in shares) | shares 272,963
Exercisable, weighted average remaining contractual life (Year) 6 years 4 months 24 days
Exercise Price Range 5 [Member]  
Per share exercise price, lower range (in dollars per share) $ 10.00
Per share exercise price, upper range (in dollars per share) $ 27.06
Outstanding, shares (in shares) | shares 44,167
Outstanding, weighted average remaining contractual life (Year) 4 years 2 months 12 days
Outstanding, weighted average exercise price (in dollars per share) $ 14.32
Exercisable, shares (in shares) | shares 34,167
Exercisable, weighted average remaining contractual life (Year) 2 years 9 months 18 days