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Note 9 - Warrants (Tables)
6 Months Ended
Jun. 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 June 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  5.12  $5.10 
$6.45   350,000  5.12  $6.45 
     2,850,000