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Property, Plant and Equipment, Net (Details) - Schedule of property, plant and equipment, net - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
At cost:
Property, plant and equipment, at cost	$ 13,110	$ 13,507
Less: Accumulated depreciation and impairment	(12,277)	(12,629)
Property, plant and equipment, net	833	878
Machinery and equipment [Member]
At cost:
Property, plant and equipment, at cost	11,738	12,135
Furniture and fixtures [Member]
At cost:
Property, plant and equipment, at cost	91	90
Leasehold improvements [Member]
At cost:
Property, plant and equipment, at cost	1,114	1,120
Motor vehicles [Member]
At cost:
Property, plant and equipment, at cost	$ 167	$ 162

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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