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Note 9 - Warrants (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Warrant Activity [Table Text Block]
    Shares  

Outstanding on December 31, 2020

     
Granted     2,850,000  
Exercised      
Outstanding as of September 30, 2021     2,850,000  
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     4.87     $ 5.10  
$6.45       350,000     4.87     $ 6.45  
         2,850,000