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Note 10 - Basic and Diluted Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

September 30,

 
  

2021

  

2020

 

Stock options

  5,089,464   4,285,880 

Stock warrants

  1,013,383   46,498,909 

Nonvested restricted stock units

  3,891,249   2,915,014 

Total

  9,994,096   53,699,803