CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Shares [Member]	Total
Balances at Jan. 31, 2010	$ 1,592,868	$ 2,988,950	$ 90,662,820	$ (3,679,641)	$ (10,587,413)	$ 80,977,584
Net income	0	0	6,139,132	0	0	6,139,132
Other comprehensive income (loss), net of tax				477,874	0	477,874
Dividends	0	0	(3,688,705)	0	0	(3,688,705)
Stock-based compensation	0	645,891	0	0	0	645,891
Stock option transactions	0	(262,537)	0	0	1,043,371	780,834
Purchase of treasury shares	0	0	0	0	(935,631)	(935,631)
Stock option tax benefit	0	75,945	0	0	0	75,945
Balances at Jan. 31, 2011	1,592,868	3,448,249	93,113,247	(3,201,767)	(10,479,673)	84,472,924
Net income	0	0	7,133,701	0	0	7,133,701
Other comprehensive income (loss), net of tax				(4,517,116)	0	(4,517,116)
Dividends	0	0	(4,018,184)	0	0	(4,018,184)
Stock-based compensation	0	744,306	0	0	0	744,306
Stock option transactions	0	(53,002)	0	0	205,972	152,970
Restricted stock unit transactions	0	(101,722)	0	0	101,722	0
Purchase of treasury shares	0	0	0	0	(167,534)	(167,534)
Stock option tax benefit	0	20,904	0	0	0	20,904
Balances at Jan. 31, 2012	1,592,868	4,058,735	96,228,764	(7,718,883)	(10,339,513)	83,821,971
Net income	0	0	8,045,223	0	0	8,045,223
Other comprehensive income (loss), net of tax				105,347	0	105,347
Dividends	0	0	(4,219,708)	0	0	(4,219,708)
Stock-based compensation	0	903,933	0	0	0	903,933
Stock option transactions	0	(13,507)	0	0	309,615	296,108
Restricted stock unit transactions	0	(69,343)	0	0	69,343	0
Purchase of treasury shares	0	0	0	0	(289,868)	(289,868)
Stock option tax benefit	0	19,370	0	0	0	19,370
Balances at Jan. 31, 2013	$ 1,592,868	$ 4,899,188	$ 100,054,279	$ (7,613,536)	$ (10,250,423)	$ 88,682,376