Significant Customers and Foreign Sales - Export sales to customers located outside the United States (Details) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Export sales to customers located outside the United States
Foreign sales revenue	$ 6,447,000	$ 5,157,000
Significant customers and foreign sales
Percent of total sales	63.00%	54.00%
One Customer
Significant customers and foreign sales
Percent of total sales	1.00%
Western Europe
Export sales to customers located outside the United States
Foreign sales revenue	1,817,000	1,261,000
Far East
Export sales to customers located outside the United States
Foreign sales revenue	3,328,000	3,399,000
Other
Export sales to customers located outside the United States
Foreign sales revenue	$ 1,302,000	$ 497,000