Consolidated Balance Sheets [Parenthetical] (USD $)	Jan. 31, 2012	Jan. 31, 2011
Common stock, par value (in dollars per share)	$ 0.40	$ 0.40
Common stock, shares authorized	8,000,000	8,000,000
Common stock, shares issued	4,201,090	4,180,239
Common stock, shares outstanding	3,770,323	3,749,472
Treasury stock, shares	430,767	430,767