Export Sales and Major Customers (Details 1)	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Percenatge sales to major customer
Sales from major customers	67.00%	61.00%
Raytheon Company [Member]
Percenatge sales to major customer
Sales from major customers	53.00%	45.00%
United States Government [Member]
Percenatge sales to major customer
Sales from major customers		16.00%
BAE Systems Australia [Member]
Percenatge sales to major customer
Sales from major customers	14.00%