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Note 12 - Basic and Diluted Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

 
   

2022

   

2021

 

Stock options

    6,766,520       4,731,249  

Stock warrants

    1,120,300       1,323,995  

Nonvested restricted stock units

    7,299,111       2,688,342  

Total

    15,185,931       8,743,586