PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021
Property, Plant and Equipment, Net
Total property, plant and equipment	$ 14,105,129	$ 14,100,931
Less: accumulated depreciation	(10,220,400)	(10,037,722)
Total property, plant and equipment, net	3,884,729	4,063,209
Land
Property, Plant and Equipment, Net
Total property, plant and equipment	110,113	110,113
Building and improvements
Property, Plant and Equipment, Net
Total property, plant and equipment	3,249,577	3,249,577
Machinery equipment, furniture and fixtures
Property, Plant and Equipment, Net
Total property, plant and equipment	10,699,776	10,695,578
Equipment under finance leases
Property, Plant and Equipment, Net
Total property, plant and equipment	$ 45,663	$ 45,663