Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Income Statement [Abstract]
Net Sales	$ 2,674,496	$ 2,310,451	$ 5,186,630	$ 4,550,663
Cost of Goods Sold	1,315,647	1,285,138	2,625,299	2,501,947
Gross Profit	1,358,849	1,025,313	2,561,331	2,048,716
Operating Expenses
Research and product development costs	301,872	312,617	604,423	616,411
Marketing and selling expenses	623,252	532,087	1,206,154	1,079,069
General and administrative costs	299,332	232,418	558,114	501,607
Rental operations expense	35,271	38,454	74,369	81,571
Total Operating Expenses	1,259,727	1,115,576	2,443,060	2,278,658
Operating Income (Loss)	99,122	(90,263)	118,271	(229,942)
Interest Expense	(11,818)	(13,367)	(24,031)	(27,113)
Interest and Dividend Income	19,068	15,521	36,211	33,104
Other (expense) income	(8,134)	811	(7,862)	202,069
Income (Loss) from Operations Before Income Taxes	98,238	(87,298)	122,589	(21,882)
Income Tax Expense	43,593	2,375	52,075	12,000
Net Income	54,645	(89,673)	70,514	(33,882)
Other Comprehensive Income
Net unrealized gain (loss) on marketable securities	32,603	36,431	59,638	92,372
Comprehensive Income	$ 87,248	$ (53,242)	$ 130,152	$ 58,490
Basic Earnings (Loss) Per Share	$ 0	$ (0.01)	$ 0.00	$ 0
Diluted Earnings (Loss) Per Share	$ 0	$ (0.01)	$ 0.00	$ 0
Weighted Average Shares - Basic	14,961,197	14,961,076	14,961,137	14,961,076
Weighted Average Shares - Diluted	15,064,631	14,961,076	15,060,026	14,961,076