Components of Deferred Tax Assets Classified as Non-Current (Detail) - USD ($)	Mar. 31, 2020	Mar. 31, 2019
Deferred tax assets:
Accounts receivable reserves	$ 38,000	$ 41,000
Inventory reserves	164,000	159,000
Accruals	20,000	21,000
Property, plant and equipment and intangible assets	91,000	227,000
Net operating loss and credit carry forwards	2,588,000	1,365,000
Valuation allowance	(2,901,000)	(1,365,000)
Total deferred tax assets	$ 0	$ 448,000