(7) Accounting for Stock-Based Compensation (Detail) (USD $)	6 Months Ended			6 Months Ended						6 Months Ended	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012	Sep. 30, 2012 Minimum [Member] Plan 2002 [Member]	Sep. 30, 2012 Maximum [Member] Plan 2002 [Member]	Sep. 30, 2012 Plan 2002 [Member]	Jul. 01, 2002 Plan 2002 [Member]	Sep. 30, 2008 Plan 2002 Amended [Member]	Sep. 30, 2005 Plan 2002 Amended [Member]	Sep. 30, 2012 Plan 2010 [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2012 Warrants [Member]	Mar. 31, 2012 Warrants [Member]	Sep. 30, 2012 Share-based Awards Made Outside of 2002 and 2010 Plans [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							750,000	1,650,000	1,250,000	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 Compensation 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	2,669,865		2,814,302			70,000				2,599,865
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date				April 2013	September 2017					May 2020					December 15, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant										15,135
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)											$ 264,980		$ 264,980					$ 479,547		$ 479,547
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards, Weighted Average Period of Recognition													1.67
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost (in Dollars)	143,117	128,097									39,747	44,424	82,612	88,848				73,350	70,439
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars)															2,846,819	2,257,314
Stock Granted During Period, Shares, Share-based Compensation										160,000
Cumulative Shares of Restricted Stock Awarded						1,185,571				385,000							189,767
Aggregate Fair Value of Cumulative Restricted Shares Granted (in Dollars)																		$ 2,634,569		$ 2,634,569
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition																				1.97