Options Outstanding under the Non-Employee Director Stock Option Plan (Detail) (USD $)			12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Non Employee Director Stock Options Plan, 2004	Mar. 31, 2013 Non Employee Director Stock Options Plan, 2004 Exercise Price $3.07	Mar. 31, 2013 Non Employee Director Stock Options Plan, 2004 Exercise Price $3.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, lower limit				$ 3.07
Range of exercise price, upper limit					$ 3.19
Amount Outstanding			50,000	25,000	25,000
Options Outstanding Weighted Average Remaining Contractual Life			3 years 2 months 12 days	2 years 9 months 18 days	3 years 7 months 6 days
Weighted Average Exercise Price			$ 3.13	$ 3.07	$ 3.19
Amount Exercisable			50,000	25,000	25,000
Options Exercisable, Weighted Average Exercise Price	$ 3.13	$ 3.13	$ 3.13	$ 3.07	$ 3.19