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Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   As of March 31, 
   2019   2018 
Buildings  $9,273,325   $9,481,048 
Machinery   2,150,738    2,471,925 
Furniture, fixture and electronic equipment   172,552    179,173 
Vehicles   68,360    73,202 
Total property plant and equipment, at cost   11,664,975    12,205,348 
Less: accumulated depreciation   (3,857,930)   (3,414,795)
Property, plant and equipment, net  $7,807,045   $8,790,553