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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

 
   

2023

   

2022

 

Common stock warrants

    88,252       111,891  

Stock options

    104,047       116,564  

Unvested restricted stock awards

    2,910       5,182  
      195,209       233,637