Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2012	Jan. 31, 2012	Apr. 30, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts receivable	$ 170	$ 170	$ 200
Common Stock, Par or Stated Value Per Share	$ 1	$ 1	$ 1
Common Stock, Shares Authorized	100,000	100,000	100,000
Common Stock, Shares, Issued	32,576	32,566	32,528
Treasury Stock, Shares	14,449	14,449	14,449