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Note 3 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
    March 31, 2024  
   

(Level 1)

   

(Level 2)

   

(Level 3)

 
                         

Assets

                       

Cash equivalents (money market accounts)

  $ 3,729,954     $     $  

Total assets measured at fair value

  $ 3,729,954     $     $  
    December 31, 2023  

Assets

                       

Cash equivalents (money market accounts)

  $ 7,792,846     $     $  

Total assets measured at fair value

  $ 7,792,846     $     $  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Three Months Ended

March 31,

 
   

2023

 

Beginning balance

  $ 12,414,000  

Fair value adjustment

    (858,000 )

Ending balance

  $ 11,556,000  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

 
   

2024

   

2023

 

Convertible preferred stock

          3,331,201  

Common stock warrants

    102,462       43,621  

Stock options

    519,257       114,525  
      621,719       3,489,347