CONSOLIDATED STATEMENT OF INCOME (unaudited) (USD $)	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
CONSOLIDATED STATEMENT OF INCOME (unaudited) [Abstract]
Net sales	$ 25,207,061	$ 23,429,903
Cost of goods sold	16,256,535	15,371,698
Gross profit	8,950,526	8,058,205
Operating expenses
Selling	3,059,581	2,916,126
General and administrative	4,144,089	3,059,103
Total selling, general and administrative	7,203,670	5,975,229
Income from operations	1,746,856	2,082,976
Interest expense	(42,535)	(48,801)
Other income	45,925	105,986
Income before taxes	1,750,246	2,140,161
Provision for taxes	491,548	727,654
Net income	$ 1,258,698	$ 1,412,507
Earnings per share, basic	$ 0.09	$ 0.10
Earnings per share, diluted	$ 0.09	$ 0.10
Cash dividend per share - declared	$ 0.071	$ 0.066
Cash dividend per share - paid	$ 0.071	$ 0.066