Segment, Geographic Location, and Customer Information - Net Sales by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	$ 20,170	$ 19,599	$ 58,004	$ 55,727
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	14,730	11,659	37,792	36,000
England [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	1,230	880	3,798	3,773
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	966	2,038	4,594	3,483
Other European countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	1,117	766	3,037	2,155
Pacific and Far East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	603	1,872	2,161	3,400
Other international [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographic location	$ 1,524	$ 2,384	$ 6,622	$ 6,916