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Plant and Equipment (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 69,474,000	$ 62,188,000
Less accumulated depreciation	(34,323,000)	(33,866,000)
Total	35,151,000	28,322,000
Foreign Countries [Member]
Property, Plant and Equipment [Line Items]
Total	25,608,000	14,919,000
Mexico [Member]
Property, Plant and Equipment [Line Items]
Total	21,822,000	12,787,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,953,000	42,976,000
Office Equipment and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,070,000	11,380,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,451,000	$ 7,832,000

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- Definition

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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