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Accrued Expenses (Tables)
 12 Months Ended
Feb. 28, 2017
Payables and Accruals [Abstract]  
Accrued expenses
   February 28,   February 29, 
   2017   2016 
Accrued compensation  $303,711   $305,189 
Estimated warranty costs   32,700    38,250 
Accrued commissions   255,604    172,461 
Professional fees   63,462    51,492 
Other accrued expenses   213,278    178,644 
   $868,755   $746,036