CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jan. 31, 2013	Jan. 31, 2012
Current assets
Accounts receivable, allowance for doubtful accounts	$ 288,102	$ 491,138
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 reacquired and held in treasury (in shares)	1,231,824	1,250,051