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Note 6 - Goodwill (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
March 31, 2021
   
December 31, 2020
 
Goodwill, balance at beginning of period
  $
3,301,439
    $
3,301,439
 
Impairment of goodwill
   
-
     
-
 
                 
Goodwill, balance at end of period
  $
3,301,439
    $
3,301,439