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Note 9 - Warrants (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Exercise Price     Number Outstanding/Exercisable     Weighted Average Remaining Life in Years     Weighted Average Exercise Price  
$5.10       2,500,000     2.37     $ 5.10  
$6.45       350,000     2.37     $ 6.45  
         2,850,000