Quarterly report pursuant to Section 13 or 15(d)

BALANCE SHEETS (Unaudited) (Parenthetical)

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BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
May 31, 2016
Feb. 29, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 27,174 $ 37,486
Patents, accumulated amortization $ 151,233 $ 147,380
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized 50,000,000 50,000,000
Common stock, issued 40,487,532 40,487,532
Common stock, outstanding 37,963,501 37,966,501
Treasury stock, shares 2,524,031 2,521,031