Commitments and Contingencies (Details)	12 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2013 GBP (£)	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)
Royalties [Abstract]
Royalty paid per unit sold		£ 10
Percentage of royalties paid on the net sales of certain products (in hundredths)	5.00%	5.00%
Minimum royalties paid periodically	4,500
Royalty expense	353,000		383,000	266,000
Purchase Requirements [Abstract]
Purchase commitments within next twelve months	281,000
Future minimum lease payments in subsequent fiscal years under noncancelable operating leases [Abstract]
2014	233,000
2015	83,000
2016	41,000
2017	3,000
Total future minimum lease payments	360,000
Total operating lease expenses	252,000		271,000	249,000
Product Liability [Abstract]
Product liability insurance coverage	$ 10,000,000