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Note 5 - Property and Equipment (Tables)
6 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31, 2019
   
June 30, 2019
 
Plant and equipment
  $
1,538,300
    $
1,511,629
 
Furniture and office equipment
   
200,147
     
188,370
 
Vehicles
   
388,354
     
332,672
 
Land and building
   
586,609
     
-
 
Total property, plant and equipment, gross
   
2,713,410
     
2,032,671
 
Accumulated depreciation
   
(1,414,955
)    
(1,275,657
)
Total property, plant and equipment, net
  $
1,298,455
    $
757,014