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Note 9 - Variable Interest Entity (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Variable Interest Entities [Table Text Block]
   
June 30
, 2018
 
Current assets
  $
71,055
 
Total assets
  $
71,055
 
Current liabilities
  $
13,201
 
Total liabilities
  $
13,201