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Customer Concentration and Foreign Sales - Export sales to customers located outside the United States (Details) - USD ($)
 12 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Export sales to customers located outside the United States    
Total sales $ 9,678,000 $ 10,849,000
Significant customers and foreign sales    
Percent of total revenues   71.00%
One Customer    
Significant customers and foreign sales    
Percent of total revenues 14.00%  
Three Customers    
Significant customers and foreign sales    
Percent of total revenues   30.00%
Asia Pacific (APAC)    
Export sales to customers located outside the United States    
Total sales $ 4,171,000 $ 4,817,000
Europe, Middle East, Asia (EMEA)    
Export sales to customers located outside the United States    
Total sales 4,287,000 4,512,000
Latin America    
Export sales to customers located outside the United States    
Total sales $ 1,220,000 $ 1,520,000