CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)	Apr. 30, 2013	Jan. 31, 2013
Current assets
Accounts receivable, allowance for doubtful accounts	$ 287,351	$ 288,102
Shareholders' equity
Common shares, par value (in dollars per share)	$ 0.10	$ 0.10
Common shares, authorized (in shares)	36,000,000	36,000,000
Common shares, issued (in shares)	15,928,679	15,928,679
Common shares reacquired and held in treasury (in shares)	1,230,581	1,231,824