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Note 12 - Basic and Diluted Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

March 31,

 
  

2023

  

2022

 

Stock options

  10,319,169   6,766,520 

Stock warrants

  1,021,076   1,120,300 

Nonvested restricted stock units

  12,657,094   7,299,111 

Total

  23,997,339   15,185,931