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Note 4 - Accounts Receivable (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 30,
2020
    
December 31,
2019
  
Accounts receivable
   $
2,127,934
     $
2,446,486
  
Expected credit losses
    
(53,821
 )    
(53,708
 )
                 
Net accounts receivable
   $
2,074,113
     $
2,392,778