Manufacturing Segment Data (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Domestic Sales, Value	$ 9,088,224	$ 13,543,528	$ 18,861,184	$ 28,244,316
International Sales, Value	14,411,100	12,289,966	28,618,851	23,174,006
Total Sales, Value	$ 23,499,324	$ 25,833,494	$ 47,480,035	$ 51,418,322
Domestic Sales, Percentgae	38.70%	52.40%	39.70%	54.90%
International Sales, Percentgae	61.30%	47.60%	60.30%	45.10%
Total Sales, Percentgae	100.00%	100.00%	100.00%	100.00%