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Note 6 - Common Stock Options (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Options

 

Exercise Price

 

Weighted-Average
Exercise Price

Options outstanding at December 31, 2020

  

5,327,425

  

$2.71

-

$21.99

 

$

6.09

 

Granted

  

130,000

  

15.83

-

17.49

  

16.69

 

Exercised

  

(743,279

)

 

2.71

-

21.99

  

6.87

 

Forfeitures

  

(88,374

)

 

4.14

-

19.30

  

9.55

 

Options outstanding at June 30, 2021

  

4,625,772

  

$2.71

-

$21.99

 

$

16.30

 
  

Options

 

Exercise Price

 

Weighted-Average
Exercise Price

Options outstanding at December 31, 2021

  

4,656,677

  

$2.71

-

$21.74

 

$

10.68

 

Granted

  

146,600

  

5.62

-

11.50

  

7.16

 

Exercised

  

-

  

-

  

-

 

Forfeitures

  

(97,308

)

 

$4.95

-

$21.74

  

14.06

 

Options outstanding at June 30, 2022

  

4,705,969

  

$2.71

-

$21.74

 

$

10.50