Earnings Per Share (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Earnings Per Share (Textual) [Abstract]
Weighted-average number of shares outstanding	25,198,000	24,913,000	25,154,000	24,894,000
Increased number of shares outstanding for diluted earnings	308,000	272,000	296,000	246,000
Dilutive common stock equivalents	293,000	560,000	287,000	629,000