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Note 5 - Stockholders' Equity, Stock Options and Warrants (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Activity [Table Text Block]
  

Stock Options

  

Warrants

 
  

Number of
Shares

  

Average
Exercise
Price

  

Number of
Shares

  

Average
Exercise
Price

 

Outstanding at December 31, 2020

  1,013,547  $5.41   7,353,376  $1.99 
                 

Issued

  147,230   1.06   29,640,801   1.44 

Forfeited

  (92,593

)

  8.64   -   - 

Expired

  -   -   (25,233

)

  10.00 

Exercised

  (5,313

)

  0.74   (5,269,059

)

  0.86 

Outstanding at December 31, 2021

  1,062,871  $4.83   31,699,885  $1.66 
                 

Issued

  14,075   0.51   21,062,714   0.70 

Forfeited

  -   -   (38,640

)

  - 

Expired

  (41,701

)

  13.41   (16,325,433

)

  26.91 

Outstanding at June 30, 2022

  1,035,245  $4.49   36,398,526  $0.74