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Note 10 - Warrants (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants

 
          

Weighted

 
      

Weighted

  

Average

 
      

Average Exercise

  

Remaining

 
  

Amount

  

Price

  

Contractual Life

 

Balance December 31, 2022

  5,824,027  $6.56   4.21 

Warrants expired

  (1,237,025) $12.70   - 

Balance December 31, 2023

  4,587,002  $4.90   4.11 

Warrants expired

  -   -   - 

Balance December 31, 2024

  4,587,002  $4.90   3.11