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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, 2019
Feb. 28, 2018
Export sales to customers located outside the United States    
Total sales $ 7,560,000 $ 6,193,000
Significant customers and foreign sales    
Percent of total revenues 65.00% 56.00%
One Customer    
Significant customers and foreign sales    
Percent of total revenues 14.00%  
Asia Pacific    
Export sales to customers located outside the United States    
Total sales $ 3,659,000 $ 2,464,000
Europe, Middle East, Asia    
Export sales to customers located outside the United States    
Total sales 2,729,000 2,617,000
Latin America    
Export sales to customers located outside the United States    
Total sales $ 1,172,000 $ 1,112,000