BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)	Jun. 30, 2017	Feb. 28, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 13,046	$ 18,046
Patents, accumulated amortization	$ 188,735	$ 180,137
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized	75,000,000	75,000,000
Common stock, issued	40,572,102	40,558,429
Common stock, outstanding	37,834,871	37,821,198
Treasury stock	2,737,231	2,737,231