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Inventories (Tables)
9 Months Ended
Nov. 30, 2019
Inventories Tables Abstract  
Inventories
   November 30,   February 28, 
   2019   2019 
Raw materials and subassemblies  $1,050,183   $873,483 
Finished goods   598,218    571,640 
Contracts in process inventory   706,582     
Work in process   802,077    483,271 
Total   3,157,060    1,928,394 
Less: Allowance   (178,280)   (270,378
Net inventories  $2,978,780   $1,658,016