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Inventories (Tables)
12 Months Ended
Feb. 28, 2017
Inventories Tables  
Inventories
   February 28,   February 29, 
   2017   2016 
Raw materials and subassemblies  $1,197,506   $1,452,566 
Finished goods   369,428    549,106 
Work in process   28,460    118,415 
Total   1,595,394    2,120,087 
Less: Allowance   (254,710)   (174,704)
Net inventories  $1,340,684   $1,945,383