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Inventories (Tables)
 3 Months Ended
May 31, 2016
Inventories Tables  
Inventories
   May 31,   February 29, 
   2016   2016 
Raw materials and subassemblies  $1,427,544   $1,452,566 
Finished goods   538,428    549,106 
Work in process   154,249    118,415 
Total   2,120,221    2,120,087 
Less: Allowance   (202,704)   (174,704)
Net inventories  $1,917,517   $1,945,383