Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Note 12 - Share-based Compensation - Stock Options Outstanding (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Outstanding, shares (in shares) | shares 1,389,564
Outstanding, weighted average remaining contractual life (Year) 7 years 182 days
Outstanding, weighted average exercise price (in dollars per share) $ 5.33
Exercisable, shares (in shares) | shares 998,738
Exercisable, weighted average remaining contractual life (Year) 7 years 36 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
Outstanding, weighted average exercise price (in dollars per share) $ 2.29
Exercisable, shares (in shares) | shares 125,700
Exercisable, weighted average remaining contractual life (Year) 5 years
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 15,000
Outstanding, weighted average remaining contractual life (Year) 6 years 73 days
Outstanding, weighted average exercise price (in dollars per share) $ 3.90
Exercisable, shares (in shares) | shares 15,000
Exercisable, weighted average remaining contractual life (Year) 6 years 73 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 950,546
Outstanding, weighted average remaining contractual life (Year) 8 years 146 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.55
Exercisable, shares (in shares) | shares 596,401
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) $ 5
Per share exercise price, upper range (in dollars per share) $ 10
Outstanding, shares (in shares) | shares 248,168
Outstanding, weighted average remaining contractual life (Year) 6 years 255 days
Outstanding, weighted average exercise price (in dollars per share) $ 8.33
Exercisable, shares (in shares) | shares 211,487
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) $ 10.01
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) 1 year 328 days
Outstanding, weighted average exercise price (in dollars per share) $ 18.22
Exercisable, shares (in shares) | shares 50,150
Exercisable, weighted average remaining contractual life (Year) 1 year 328 days