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Inventories (Tables)
3 Months Ended
May 31, 2019
Inventories Tables Abstract  
Inventories
   May 31,   February 28, 
   2019   2019 
Raw materials and subassemblies  $906,384   $873,483 
Finished goods   511,267    571,640 
Contracts in process inventory   600,204     
Work in process   645,243    483,271 
Total   2,663,098    1,928,394 
Less: Allowance   (284,378)   (270,378)
Net inventories  $2,378,720   $1,658,016