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Significant Customers and Foreign Sales - Export sales to customers located outside the United States (Details) (USD $)
 12 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Export sales to customers located outside the United States    
Foreign sales revenue $ 5,157,000 $ 7,385,000
Significant customer    
Percent of total sales 54.00% 62.00%
One Customer
    
Significant customer    
Percent of total sales 4.60%  
Western Europe
    
Export sales to customers located outside the United States    
Foreign sales revenue 1,261,000 2,832,000
Far East
    
Export sales to customers located outside the United States    
Foreign sales revenue 3,399,000 4,053,000
Other
    
Export sales to customers located outside the United States    
Foreign sales revenue $ 497,000 $ 500,000