Segment, Geographic Location and Customer Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net sales by geographic location
Net sales by geographic location	$ 14,413	$ 18,248
United States [Member]
Net sales by geographic location
Net sales by geographic location	8,816	13,539
Italy [Member]
Net sales by geographic location
Net sales by geographic location	1,850	817
England [Member]
Net sales by geographic location
Net sales by geographic location	658	398
Other European countries [Member]
Net sales by geographic location
Net sales by geographic location	687	670
Pacific and Far East [Member]
Net sales by geographic location
Net sales by geographic location	454	322
Other International [Member]
Net sales by geographic location
Net sales by geographic location	$ 1,948	$ 2,502