Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	May 31, 2018	May 31, 2017
Income Statement [Abstract]
Net Sales	$ 2,700,860	$ 2,500,734
Cost of Goods Sold	1,429,663	1,320,217
Gross Profit	1,271,197	1,180,517
Operating Expenses
Research and product development costs	333,866	309,251
Marketing and selling expenses	629,788	587,798
General and administrative costs	275,392	262,389
Total Operating Expenses	1,239,046	1,159,438
Operating Income	32,151	21,079
Interest Expense	(10,614)	(12,213)
Interest and Dividend Income	34,606	17,143
Realized gain on sale of marketable securities	29,392	0
Net unrealized loss on marketable securities	(49,061)	0
Other income	2,520	(1,658)
Income Before Income Taxes	38,994	24,351
Income Tax Expense	17,564	8,482
Net Income	21,430	15,869
Other Comprehensive Income
Net unrealized gain (loss) on marketable securities	0	27,035
Comprehensive Income	$ 0	$ 42,904
Basic Earnings Per Share	$ 0.00	$ 0.00
Diluted Earnings Per Share	$ 0.00	$ 0.00
Weighted Average Shares - Basic	14,987,613	14,961,076
Weighted Average Shares - Diluted	15,088,512	15,057,495