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Note 9 - Warrants (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Warrant Activity [Table Text Block]
    Shares  
Outstanding on December 31, 2020
   
 
Granted    
2,850,000
 
Exercised    
 
Outstanding as of March 31, 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
   
5.44
    $
5.10
 
$6.45      
350,000
   
5.44
    $
6.45
 
        
2,850,000