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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (10Q) (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
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  
   

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