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

June 30, 

 
  

2021

  

2020

 

Stock options

  4,279,335   4,278,967 

Stock warrants

  1,016,383   46,461,630 

Nonvested restricted stock units

  1,768,861   3,036,176 

Total

  7,064,579   53,776,773