CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jan. 31, 2012	Jan. 31, 2011
Current assets
Allowance for doubtful accounts	$ 491,000	$ 444,000
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	1,270,417