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Note 5 - Stockholders' Equity (Deficit) (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Number of shares

  

Weighted average grant date fair value per share

 

Unvested as of December 31, 2021

  769,486  $10.46 

Granted

  478,000   2.12 

Vested

  (234,239)  9.53 

Forfeited

  (88,875)  8.36 

Unvested as of June 30, 2022

  924,372  $6.55