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Note 8 - Variable Interest Entity (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Variable Interest Entities [Table Text Block]
   
March 31, 2018
 
Current assets
  $
100,497
 
Total assets
  $
100,497
 
Current liabilities
  $
19,331
 
Total liabilities
  $
19,331