EMPLOYEE BENEFIT PLANS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Components of net periodic pension (income) cost [Abstract]
Service cost	$ 56,035	$ 51,442	$ 112,070	$ 102,842
Interest cost	272,218	280,364	544,436	560,764
Expected return on plan assets	(304,822)	(350,481)	(609,644)	(700,981)
Recognized net actuarial loss	109,991	52,443	219,982	104,943
Net periodic benefit cost	133,422	33,768	266,844	67,568
Company contributions during the period			1,627,122	2,951,289
Expected additional company contributions in current fiscal year	$ 47,122		$ 47,122