CONSOLIDATED BALANCE SHEET (unaudited) (Parenthetical) (USD $)	Apr. 30, 2012	Jan. 31, 2012
Current assets
Allowance for doubtful accounts	$ 452,000	$ 491,000
Shareholders' equity
Common shares, par value (in dollars per share)	$ 0.1	$ 0.1
Common shares authorized (in shares)	36,000,000	36,000,000
Common shares issued (in shares)	15,928,679	15,928,679
Common shares held in treasury (in shares)	1,250,051	1,250,051