CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2012	Jan. 31, 2012
Accounts receivable, allowance for doubtful accounts	$ 972	$ 972
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,534,444	31,876,815
Common stock, shares outstanding	32,494,660	31,837,031
Treasury stock, common shares	102,784	39,784