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Note 3 - Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31,
2017
    
December 31
2016
  
Accounts receivable
   $
46,664
     $
44,860
  
                 
Provision for doubtful accounts
    
(27,666
 )    
(27,666
 )
                 
Net accounts receivable
  $
18,998
     $
17,194