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Note 3 - Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
             
   
June 30, 2018
    
December 31, 2017
  
Accounts receivable
   $
15,907
     $
42,688
  
                 
Provision for doubtful accounts
    
-
      
(27,666
 )
                 
Net accounts receivable
   $
15,907
     $
15,022