(8) Stockholders' Equity (Detail) (USD $)	12 Months Ended			1 Months Ended				1 Months Ended		12 Months Ended					12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Jul. 01, 2002 2002 Long-Term Incentive Plan (the "2002 Plan")	Mar. 31, 2013 2002 Long-Term Incentive Plan (the "2002 Plan")	Sep. 30, 2005 2002 Long-Term Incentive Plan (the "2002 Plan")	Sep. 30, 2008 2002 Long-Term Incentive Plan (the "2002 Plan") Amended	Mar. 25, 2010 2010 Equity Incentive Plan (the "2010 Plan")	Mar. 31, 2013 2010 Equity Incentive Plan (the "2010 Plan")	Mar. 31, 2013 Stock Options	Mar. 31, 2012 Stock Options	Mar. 31, 2013 Warrants	Mar. 31, 2012 Warrants	Mar. 31, 2013 Restricted stock not issued under Company's 2002 or 2010 Plans	Mar. 31, 2013 Restricted Stock	Mar. 31, 2012 Restricted Stock	Mar. 31, 2013 Restricted Stock Maximum	Mar. 31, 2013 Restricted Stock Minimum
Share-based compensation arrangement by share-based payment award, number of shares authorized				750,000		1,250,000	1,650,000	3,000,000
Share-based compensation arrangement by share-based payment award, terms of award				Grants under the 2002 Plan are awarded by a committee of the Board of Directors, and are exercisable over periods not exceeding ten years from date of grant. The option price for incentive stock options granted under the 2002 Plan must be at least 100% of the fair market value of the shares on the date of grant, while the price for non-qualified options granted is determined by the Committee of the Board of Directors.				The exercise price per share of a stock option, which is determined by the Compensation Committee, may not be less than 100% of the fair market value of the common stock on the date of grant. For non-qualified options the term of the option is determined by the Compensation Committee. For incentive stock options the term of the option is not more than ten years. However, if the optionee owns more than 10% of the total combined voting power of the Company, the term of the incentive stock option will be no longer than five years.							The shares of restricted stock granted pursuant to such agreements vest in various tranches over one to five years from the date of grant.
Share-based compensation arrangement by share-based payment award, options, outstanding, number	2,525,428	2,814,302	3,048,677		70,000			2,744,302	2,455,428
Share-based compensation arrangement by share-based payment award, number of shares available for grant									45,135
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, stock options										$ 185,486					$ 321,355
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition										1 year 2 months 1 day					1 year 8 months 12 days
Total compensation cost for outstanding option awards										162,106	177,696				280,009	266,580
Class of warrant or right, outstanding												2,456,272	2,456,272
Class of warrant or right, exercise price of warrants or rights (in dollars per Item)												0.001	0.001
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value (in dollars)												3,313,511	2,257,314
Options															160,000	250,500
Cumulative shares of restricted stock awarded					1,185,571				355,000					189,767
Aggregate fair value of cumulative restricted shares granted (in dollars)															$ 2,612,944
Percentage of minimum option price				100.00%				100.00%
Maximum term of option								10 years
Percentage of voting power owned by option holders								10.00%
Maximum term of the incentive stock options in case the option holder owns ten percent of voting power								5 years
Vesting period																	5 years	1 year