PROPERTY AND EQUIPMENT, NET (Summary of Property and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Property and equipment
Gross property and equipment	$ 34,701	$ 34,530
Less: accumulated depreciation	(23,229)	(22,713)
Total property and equipment, net	11,472	11,817
Land and land improvements
Property and equipment
Gross property and equipment	433	433
Buildings and building improvements
Property and equipment
Gross property and equipment	9,474	9,470
Furniture, fixtures and office equipment
Property and equipment
Gross property and equipment	7,256	7,270
Leasehold Improvements
Property and equipment
Gross property and equipment	324	324
Equipment leased to customers
Property and equipment
Gross property and equipment	4,997	4,997
Plant equipment
Property and equipment
Gross property and equipment	12,210	12,021
Construction in Progress
Property and equipment
Gross property and equipment	$ 7	$ 15

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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