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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Sep. 30, 2021
Mar. 31, 2021
Property, Plant and Equipment, Net    
Total property, plant and equipment $ 22,786,659 $ 14,100,931
Less: accumulated depreciation (10,480,258) (10,037,722)
Total property, plant and equipment, net 12,306,401 4,063,209
Land    
Property, Plant and Equipment, Net    
Property, Plant and Equipment, Gross 110,113 110,113
Building and improvements    
Property, Plant and Equipment, Net    
Property, Plant and Equipment, Gross 3,289,901 3,249,577
Machinery and equipment    
Property, Plant and Equipment, Net    
Property, Plant and Equipment, Gross 17,883,604 10,113,670
Furniture, fixtures, auto equipment    
Property, Plant and Equipment, Net    
Property, Plant and Equipment, Gross $ 1,503,041 $ 627,571