Components of Deferred Tax Assets Classified as Non-Current (Detail) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Deferred tax assets:
Accounts receivable reserves	$ 86,000	$ 123,000
Inventory reserves	125,000	201,000
Accruals	43,000	17,000
Property, plant and equipment and intangible assets	262,000	438,000
Net operating loss and credit carry forwards	460,000	300,000
Valuation allowance	(448,000)	(288,000)
Total deferred tax assets	$ 528,000	$ 791,000