UNAUDITED QUARTERLY RESULTS OF OPERATIONS (Details) (USD $)	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2015	Jan. 31, 2014
Quarterly Financial Data [Line Items]
Net sales	$ 26,524,000	$ 25,093,000	$ 24,610,000	$ 23,507,000	$ 22,222,000	$ 22,787,000	$ 24,639,000	$ 21,737,000	$ 99,733,744	$ 91,384,695
Gross profit	9,942,000	8,608,000	8,062,000	7,099,000	6,249,000	5,042,000	7,462,000	6,080,000	33,711,949	24,833,341
Earnings from operations	2,210,000	698,000	1,467,000	582,000	(389,000)	(1,030,000)	1,297,000	(237,000)	8,398,704	(119,501)
Net income (loss)	$ 11,285,000	$ (2,500,000)	$ (386,000)	$ 0	$ (1,611,000)	$ (1,835,000)	$ 4,171,000	$ (844,000)	$ 8,398,704	$ (119,501)
Basic net earnings (loss) per share (in dollars per share)	$ 1.35	$ (0.42)	$ (0.07)	$ 0.00	$ (0.27)	$ (0.31)	$ 0.75	$ (0.16)	$ 1.35	$ (0.02)
Diluted net earnings (loss) per share (in dollars per share)	$ 1.58	$ (0.42)	$ (0.07)	$ 0.00	$ (0.27)	$ (0.31)	$ 0.74	$ (0.16)	$ 1.33	$ (0.02)