Shareholders Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2011	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2013
Equity [Abstract]
Common stock issued in follow-on public offering	2,300,000
Net proceeds to company	$ 31,000			$ 31,028
Number of shares authorized to repurchase					1,000,000
Repurchase of common stock during period		147,900
Average price of shares repurchased		$ 14.82
Preferred stock, shares authorized		1,000,000	1,000,000
Preferred stock, shares outstanding
Common stock, shares authorized		20,000,000	20,000,000
Common stock, shares issued		13,907,000	13,763,000
Shares surrendered in exchange for payment of taxes		994	290	1,000
Average fair value of shares		$ 14.99	$ 12.60	$ 14.10