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Note 5 - Property and Equipment (Tables)
3 Months Ended
Sep. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30
,
2019
   
June 30,
2019
 
Plant and equipment
  $
1,422,669
    $
1,511,629
 
Furniture and office equipment
   
190,386
     
188,370
 
Vehicles
   
376,108
     
332,672
 
Land and building
   
575,082
     
-
 
Total property, plant and equipment, gross
   
2,564,245
     
2,032,671
 
Accumulated depreciation
   
(1,264,379
)
   
(1,275,657
)
Total property, plant and equipment, net
  $
1,299,866
    $
757,014