Shareholders' Equity - Additional Information (Detail) (USD $)	9 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	50,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding and exercisable with exercise prices	3.07
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding and exercisable with exercise prices	3.19
Stock Options 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	25,000
Option outstanding, expiration period	2016-01
Stock Options 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	25,000
Option outstanding, expiration period	2016-11