Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Current:
Accounts receivable reserves	$ 881	$ 1,445
Inventory reserves	401	368
Accruals	237	214
Stock warrants	166	166
Non-current:
Property, plant, and equipment	1,169	699
Net operating loss and credit carryforwards	107	1,235
Stock compensation	79	79
Gross deferred tax assets	3,040	4,206
Valuation allowances	(234)	(234)
Total deferred tax assets	2,806	3,972
Non-current:
Capital lease expense	194	177
Total Deferred Tax Liabilities	194	177
Net deferred tax assets	$ 2,612	$ 3,795