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Note 3 - Accounts Receivable (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September
30, 2017
    
December
31, 2016
  
Accounts receivable
   $
44,132
     $
44,860
  
                 
Provision for doubtful accounts
    
(27,666
 )    
(27,666
 )
                 
Net accounts receivable
   $
16,466
     $
17,194