Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011	Oct. 31, 2010
Allowance for doubtful accounts	$ 200	$ 300	$ 299
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	100,000	100,000	100,000
Common stock, shares issued	32,548	32,511	32,492
Treasury stock, shares	14,449	14,449	14,449