Manufacturing Segment Data (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Net sales	$ 22,787,344	$ 24,238,573	$ 69,163,340	$ 71,718,608
Sales Revenue, Goods, Net [Member]
Sales Revenue, Percentage	100.00%	100.00%	100.00%	100.00%
Domestic [Member]
Net sales	11,500,000	9,800,000	35,700,000	28,700,000
Domestic [Member] | Sales Revenue, Goods, Net [Member]
Sales Revenue, Percentage	50.00%	41.00%	52.00%	40.00%
International [Member]
Net sales	$ 11,300,000	$ 14,400,000	$ 33,500,000	$ 43,000,000
International [Member] | Sales Revenue, Goods, Net [Member]
Sales Revenue, Percentage	50.00%	59.00%	48.00%	60.00%