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Note 9 - Warrants (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Range of Exercise Price     Number Outstanding/Exercisable     Weighted Average Remaining Life in Years     Weighted Average Exercise Price  
$5.10       2,500,000     3.12     $ 5.10  
$6.45       350,000     3.12     $ 6.45  
         2,850,000