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Significant Customers and Foreign Sales (Tables)
12 Months Ended
Feb. 29, 2020
Segment Reporting [Abstract]  
Export sales to customers located outside the United States
   February 29,
2020
   February 28,
2019
 
Asia Pacific (APAC)   4,817,000    3,659,000 
Europe, Middle East, Asia (EMEA)   4,512,000    2,729,000 
Latin America   1,520,000    1,172,000 
   $10,849,000   $7,560,000