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Note 2 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 

Excluded potentially dilutive weighted average securities (1):

 

2023

  

2022

  

2023

  

2022

 
                 

Options to purchase common stock

  417,749   1,020,949   704,316   1,023,814 

Unvested restricted stock units

  6,181,141   4,126,930   5,770,715   4,277,456 

Financing warrants to purchase common stock

  6,372   6,372   6,372   6,372 

Total potential dilutive weighted average securities

  6,605,262   5,154,251   6,481,403   5,307,642