Components of Deferred Tax Assets Classified as Non-Current (Detail) - USD ($)	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Accounts receivable reserves	$ 123,000	$ 548,000
Inventory reserves	201,000	284,000
Accruals	17,000	42,000
Property, plant and equipment and intangible assets	438,000	504,000
Net operating loss and credit carry forwards	300,000	23,000
Valuation allowance	(288,000)
Total deferred tax assets	$ 791,000	$ 1,401,000