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Note 8 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of

   

Weighted

 
   

Common Stock

   

Average

 
   

Warrants

   

Exercise Price

 

Balance, December 31, 2022

    2,424,724     $ 6.36  

Warrants expired

    (296,295 )     6.75  

Balance, December 31, 2023

    2,128,429     $ 6.30