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Note 13 - Basic and Diluted Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

September 30,

 
  

2022

  

2021

 

Stock options

  7,404,858   5,089,464 

Stock warrants

  1,021,076   1,013,383 

Nonvested restricted stock units

  8,038,575   3,891,249 

Total

  16,464,509   9,994,096