Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Note 11 - Share-based Compensation - Stock Options Outstanding (Details)
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Outstanding, shares (in shares) | shares 1,959,100
Outstanding, weighted average remaining contractual life (Year) 7 years 6 months
Outstanding, weighted average exercise price (in dollars per share) $ 5.63
Exercisable, shares (in shares) | shares 1,224,883
Exercisable, weighted average remaining contractual life (Year) 6 years 8 months 12 days
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 123,000
Outstanding, weighted average remaining contractual life (Year) 4 years 2 months 12 days
Outstanding, weighted average exercise price (in dollars per share) $ 2.40
Exercisable, shares (in shares) | shares 123,000
Exercisable, weighted average remaining contractual life (Year) 4 years 2 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 233,008
Outstanding, weighted average remaining contractual life (Year) 7 years 6 months
Outstanding, weighted average exercise price (in dollars per share) $ 3.78
Exercisable, shares (in shares) | shares 22,500
Exercisable, weighted average remaining contractual life (Year) 5 years 2 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 938,567
Outstanding, weighted average remaining contractual life (Year) 7 years 8 months 12 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.51
Exercisable, shares (in shares) | shares 801,525
Exercisable, weighted average remaining contractual life (Year) 7 years 6 months
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 594,525
Outstanding, weighted average remaining contractual life (Year) 8 years 6 months
Outstanding, weighted average exercise price (in dollars per share) $ 6.37
Exercisable, shares (in shares) | shares 224,525
Exercisable, weighted average remaining contractual life (Year) 6 years 3 months 18 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 70,000
Outstanding, weighted average remaining contractual life (Year) 3 years 6 months
Outstanding, weighted average exercise price (in dollars per share) $ 16.49
Exercisable, shares (in shares) | shares 53,333
Exercisable, weighted average remaining contractual life (Year) 1 year 7 months 6 days