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Note 2 - Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
2019
    
2018
  
Accounts receivable
   $
223,116
     $
226,104
  
Less: allowance for doubtful accounts
    
(4,662
 )    
(7,315
 )
Net accounts receivable
   $
218,454
     $
218,789