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Note 5 - Property and Equipment, Net (Tables)
9 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
201
9
   
June 30,
201
8
 
Plant and equipment
  $
1,529,210
    $
1,487,568
 
Furniture and office equipment
   
185,970
     
171,978
 
Vehicles
   
328,746
     
351,381
 
Total property, plant and equipment, gross
   
2,043,926
     
2,010,927
 
Accumulated depreciation
   
(1,189,681
)
   
(930,456
)
Total property, plant and equipment, net
  $
854,245
    $
1,080,471