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Note 3 - Basis of Presentation and 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]
  

As of June 30,

 
  

2022

  

2021

 

Common stock warrants

  111,891   129,989 

Stock options

  122,882   61,058 

Unvested restricted stock awards

  4,672   3,060 
   239,445   194,107