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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, 2017
Feb. 29, 2016
Export sales to customers located outside the United States    
Total sales $ 5,361,000 $ 6,577,000
Significant customers and foreign sales    
Percent of total sales 56.00% 56.00%
One Customer    
Significant customers and foreign sales    
Percent of total sales 7.00%  
Western Europe    
Export sales to customers located outside the United States    
Total sales   $ 2,643,000
Far East    
Export sales to customers located outside the United States    
Total sales   2,947,000
Middle East    
Export sales to customers located outside the United States    
Total sales   247,000
Other    
Export sales to customers located outside the United States    
Total sales   111,000
Western Europe    
Export sales to customers located outside the United States    
Total sales $ 1,695,000  
Far East    
Export sales to customers located outside the United States    
Total sales 2,702,000  
Middle East    
Export sales to customers located outside the United States    
Total sales 232,000  
South America    
Export sales to customers located outside the United States    
Total sales 208,000 208,000
Mexico    
Export sales to customers located outside the United States    
Total sales 275,000 $ 421,000
Other    
Export sales to customers located outside the United States    
Total sales $ 249,000