Manufacturing Segment Data (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Net sales	$ 24,639,006	$ 23,499,324	$ 46,375,996	$ 47,480,035
Sales Revenue, Goods, Net [Member]
Sales Revenue, Percentage	100.00%	100.00%	100.00%	100.00%
Domestic [Member]
Net sales	12,320,000	9,090,000	24,190,000	18,860,000
Domestic [Member] | Sales Revenue, Goods, Net [Member]
Sales Revenue, Percentage	50.00%	38.70%	52.10%	39.70%
International [Member]
Net sales	$ 12,320,000	$ 14,410,000	$ 22,190,000	$ 28,620,000
International [Member] | Sales Revenue, Goods, Net [Member]
Sales Revenue, Percentage	50.00%	61.30%	47.90%	60.30%