Supplementary Financial Information - Inventories, Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Inventories
Materials and supplies	$ 5,680	$ 2,714
Work in process	200	435
Finished goods	2,100	1,917
Total inventories	7,980	5,066
Property and Equipment, net
Accumulated depreciation	(8,550)	(7,929)
Property and Equipment, net	1,392	1,923
Equipment
Property and Equipment, net
Property, plant and equipment, gross	6,825	6,806
Leasehold improvements
Property and Equipment, net
Property, plant and equipment, gross	$ 3,117	$ 3,046

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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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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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