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Note 2 - Basis of Presentation and Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

2022

 

Convertible preferred stock

  - 

Convertible preferred stock warrants

  - 

Common stock warrants

  331,580 

Stock options

  3,298,180 
   3,629,760