Components of Deferred Tax Assets Classified as Non-Current (Detail) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Accounts receivable reserves	$ 41,000	$ 86,000
Inventory reserves	159,000	125,000
Accruals	21,000	43,000
Property, plant and equipment and intangible assets	227,000	262,000
Net operating loss and credit carry forwards	1,365,000	460,000
Valuation allowance	(1,365,000)	(448,000)
Total deferred tax assets	$ 448,000	$ 528,000