SELECTED QUARTERLY FINANCIAL INFORMATION (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
SELECTED QUARTERLY FINANCIAL INFORMATION (Unaudited) [Abstract]
Net Sales	$ 26,976,263	$ 29,761,356	$ 27,997,242	$ 25,207,061	$ 28,397,015	$ 25,245,131	$ 23,089,343	$ 23,429,903	$ 109,941,922	$ 100,161,392	$ 88,865,426
Gross Profit	9,473,878	10,664,515	8,698,104	8,950,526	9,838,973	9,334,848	8,136,981	8,058,205	37,787,023	35,369,007	32,278,100
Net Income	$ 2,375,791	$ 2,790,735	$ 1,619,999	$ 1,258,698	$ 2,149,074	$ 2,081,886	$ 1,490,234	$ 1,412,507	$ 8,045,223	$ 7,133,701	$ 6,139,132
Earnings Per Share, Basic (in dollars per share)	$ 0.16	$ 0.19	$ 0.11	$ 0.09	$ 0.15	$ 0.14	$ 0.10	$ 0.10	$ 0.55	$ 0.49	$ 0.42
Earnings Per Share, Diluted (in dollars per share)	$ 0.16	$ 0.19	$ 0.11	$ 0.09	$ 0.15	$ 0.14	$ 0.10	$ 0.10	$ 0.55	$ 0.48	$ 0.42