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Note 3 - Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
2018
    
2017
  
Accounts receivable
   $
39,769
     $
42,688
  
                 
Provision for doubtful accounts
    
(27,666
 )    
(27,666
 )
                 
Net accounts receivable
   $
12,103
     $
15,022