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Accrued Expenses (Tables)
 12 Months Ended
Feb. 28, 2019
Payables and Accruals [Abstract]  
Accrued expenses
   February 28, 
   2019   2018 
Accrued compensation  $284,587   $362,405 
Estimated warranty costs   62,500    64,050 
Accrued commissions   100,114    194,934 
Professional fees   65,049    64,928 
Other accrued expenses   120,456    206,875 
   $632,706   $893,192