CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) [Abstract]
Net income	$ 1,619,999	$ 1,490,234	$ 2,878,697	$ 2,902,741
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(425,061)	(121,100)	(331,576)	346,920
Interest rate swap, net of tax of ($3,374), $16,287, $6,072 and $16,135, respectively	(10,338)	(27,474)	5,745	(27,733)
Other comprehensive (loss) income, net of tax	(435,399)	(148,574)	(325,831)	319,187
Total comprehensive income	$ 1,184,600	$ 1,341,660	$ 2,552,866	$ 3,221,928