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Note 2 - Summary of Significant Accounting Policies (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,

 

Excluded potentially dilutive securities (1):

 

2022

  

2021

 
         

Options to purchase common stock

  1,009,230   1,038,439 

Unvested restricted stock units

  4,307,768   4,840,763 

Financing warrants to purchase common stock

  6,372   6,372 

Total potential dilutive securities

  5,323,370   5,885,574