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Note 5 - Property and Equipment, Net (Tables)
3 Months Ended
Sep. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30
,
2018
   
June 30,
201
8
 
Plant and equipment
  $
1,467,431
    $
1,487,568
 
Furniture and office equipment
   
174,235
     
171,978
 
Vehicles
   
343,307
     
351,381
 
Total property, plant and equipment, gross
   
1,984,973
     
2,010,927
 
Accumulated depreciation
   
(987,909
)
   
(930,456
)
Total property, plant and equipment, net
  $
997,064
    $
1,080,471