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

June 30,

 
  

2022

  

2021

 

Stock options

  7,112,573   4,279,335 

Stock warrants

  1,120,300   1,016,383 

Nonvested restricted stock units

  7,985,275   1,768,861 

Total

  16,218,148   7,064,579