Earnings Per Share - Components of Denominator for Basic Earnings Per Common Share and Diluted Earnings Per Common Share (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Basic earnings per Common Share:
Weighted-average common shares outstanding for basic earnings per share calculation	9,667,000	9,518,000	9,625,000	9,503,000
Diluted earnings per Common Share:
Weighted-average basic shares outstanding	9,667,000	9,518,000	9,625,000	9,503,000
Stock options	130,000	74,000	108,000	60,000
Weighted-average common shares outstanding for diluted earnings per share calculation	9,797,000	9,592,000	9,733,000	9,563,000