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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (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

 

Common stock warrants

  111,891   112,963 

Stock options

  116,564   62,336 

Unvested restricted stock awards

  5,182   3,060 
   233,637   178,359