Condensed Consolidated Statements of Operations and Other Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Income Statement [Abstract]
Net Sales	$ 2,310,451	$ 2,974,673	$ 4,550,663	$ 5,857,570
Cost of Goods Sold	1,285,138	1,485,069	2,501,947	2,994,835
Gross Profit	1,025,313	1,489,604	2,048,716	2,862,735
Operating Expenses
Research and product development costs	312,617	332,806	616,411	614,937
Marketing and selling expenses	532,087	592,074	1,079,069	1,163,701
General and administrative costs	232,418	287,503	501,607	544,288
Rental operations expense	38,454	38,787	81,571	78,332
Total Operating Expenses	1,115,576	1,251,170	2,278,658	2,401,258
Operating Income (Loss)	(90,263)	238,434	(229,942)	461,477
Interest Expense	(13,367)	(14,851)	(27,113)	(30,064)
Interest Income	15,521	12,708	33,104	26,395
Other (expense) income	811	(40,180)	202,069	(54,460)
Income (Loss) from Operations Before Income Taxes	(87,298)	196,111	(21,882)	403,348
Income Tax Expense	2,375	52,521	12,000	105,736
Net Income (Loss)	(89,673)	143,590	(33,882)	297,612
Other Comprehensive Income
Net unrealized gain on marketable securities	36,431		92,372
Comprehensive Income (loss)	$ (53,242)	$ 143,590	$ 58,490	$ 297,612
Basic Earnings (Loss) Per Share	$ (0.01)	$ 0.01	$ 0.00	$ 0.02
Diluted Earnings Per (Loss) Share	$ (0.01)	$ 0.01	$ 0.00	$ 0.02
Weighted Average Shares - Basic	14,961,076	14,944,124	14,961,076	14,938,615
Weighted Average Shares - Diluted	14,961,076	15,046,066	14,961,076	15,033,588