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Note 7 - Warrants (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Warrant Activity [Table Text Block]
  

Shares

 

Outstanding as of December 31, 2022

  2,850,000 

Granted

   

Exercised

   

Outstanding as of December 31, 2023

  2,850,000 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
    

Number

  

Weighted-Average

     
    

Outstanding/

  

Remaining Life

  

Weighted-Average

 

Range of Exercise Price

  

Exercisable

  

in Years

  

Exercise Price

 
$5.10   2,500,000   2.62  $5.10 
$6.45   350,000   2.62  $6.45 
     2,850,000