Summary of Significant Accounting Policies, Part 4 (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Impairment of Long Lived Assets [Abstract]
Impairment of long-lived assets	$ 0	$ 0	$ 0
Product Warranty [Abstract]
Period of service of the product after the date of sale	12 months
Product warranty expense	11,000	37,000	15,000
Deferred Rent [Abstract]
Period of operating lease term agreement	8 years
Incentive from lender	280,000
Foreign Currency Translation [Abstract]
Foreign currency exchange gain (loss)	1,573	3,780	10,722
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Gross carrying amount	5,603,000	5,586,000
Accumulated amortization	5,502,000	4,640,000
Net value	101,000	946,000
Annual amortization for intangible assets in subsequent fiscal years [Abstract]
2014	27,000
2015	25,000
2016	23,000
2017	20,000
2018 and beyond	6,000
Net value	$ 101,000	$ 946,000