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Note 9 - Basic and Diluted Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

March 31,

 
  

2021

  

2020

 

Stock options

  4,731,249   4,361,872 

Stock warrants

  1,323,995   46,498,909 

Nonvested restricted stock units

  2,688,342   2,959,099 

Total

  8,743,586   53,819,880