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, 2009	$ 1,592,868	$ 2,465,193	$ 89,727,308	$ (4,324,293)	$ (10,683,595)	$ 78,777,481
Comprehensive income:
Net income	0	0	4,439,811	0	0	4,439,811
Foreign currency translation adjustment	0	0	0	439,575	0
Interest rate swap, net of tax	0	0	0	60,621	0
Minimum pension liability adjustment, net of tax	0	0	0	144,456	0
Total comprehensive income						5,084,463
Dividends	0	0	(3,504,299)	0	0	(3,504,299)
Stock-based compensation	0	645,967	0	0	0	645,967
Stock option transactions	0	(122,210)	0	0	347,794	225,584
Purchase of treasury shares	0	0	0	0	(251,612)	(251,612)
Balances at Jan. 31, 2010	1,592,868	2,988,950	90,662,820	(3,679,641)	(10,587,413)	80,977,584
Comprehensive income:
Net income	0	0	6,139,132	0	0	6,139,132
Foreign currency translation adjustment	0	0	0	(82,149)	0
Interest rate swap, net of tax	0	0	0	(10,284)	0
Minimum pension liability adjustment, net of tax	0	0	0	570,307	0
Total comprehensive income						6,617,006
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
Comprehensive income:
Net income	0	0	7,133,701	0	0	7,133,701
Foreign currency translation adjustment	0	0	0	(230,532)	0
Interest rate swap, net of tax	0	0	0	(57,946)	0
Minimum pension liability adjustment, net of tax	0	0	0	(4,228,638)	0
Total comprehensive income						2,616,585
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