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Stock Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended
	Dec. 31, 2006	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding		50,000
Weighted average exercise price of exercisable options		$ 3.13	$ 3.13
Lower Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding and exercisable with exercise prices		$ 3.07
Upper Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding and exercisable with exercise prices		$ 3.19
Employee Stock Option Plan, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum aggregate number of shares of common stock available					2,500,000
Non Employee Director Stock Options Plan, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum aggregate number of shares of common stock available					250,000
Additional number of shares of common stock available	500,000
Options outstanding		50,000	50,000	50,000
Options outstanding and exercisable with exercise prices		$ 3.13
Weighted average exercise price of exercisable options		$ 3.13

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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