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Accrued Expenses (Tables)
12 Months Ended
Feb. 28, 2015
Payables and Accruals [Abstract]  
Accrued expenses
   February 28, 
   2015   2014 
Accrued compensation  $214,071   $201,676 
Estimated warranty costs   36,000    30,900 
Accrued commissions   207,236    156,964 
Professional fees   51,765    44,692 
Other accrued expenses   182,865    130,889 
   $691,937   $565,121