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Significant Customers and Foreign Sales (Tables)
12 Months Ended
Feb. 28, 2019
Segment Reporting [Abstract]  
Export sales to customers located outside the United States
   February 28, 
   2019   2018 
Asia Pacific (APAC)   3,659,000    2,464,000 
Europe, Middle East, Asia (EMEA)   2,729,000    2,617,000 
Latin America   1,172,000    1,112,000 
   $7,560,000   $6,193,000