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Note 9 - Warrants (Tables)
3 Months Ended
Mar. 31, 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  3.37  $5.10 
$6.45   350,000  3.37  $6.45 
     2,850,000