Summary of Significant Accounting Policies, Part 4 (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
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	3,000	11,000	37,000
Foreign Currency Translation [Abstract]
Foreign currency exchange gain (loss)	(5,000)	2,000	4,000
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Gross carrying amount	5,653,000	5,603,000
Accumulated amortization	5,533,000	5,502,000
Net value	120,000	101,000
Annual amortization for intangible assets in subsequent fiscal years [Abstract]
2015	42,000
2016	39,000
2017	29,000
2018	5,000
2019 and beyond	5,000
Net value	$ 120,000	$ 101,000