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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

December 31,

 
   

2022

   

2021

 

Common stock warrants

    111,891       129,989  

Stock options

    140,040       72,454  

Unvested restricted stock units

    3,652       5,509  
      255,583       207,952