Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Income Statement [Abstract]
Net Sales	$ 2,391,107	$ 3,149,960	$ 5,230,809	$ 6,139,028
Cost of Goods Sold	1,225,735	1,471,513	2,715,739	3,027,484
Gross Profit	1,165,373	1,678,447	2,515,070	3,111,544
Operating Expenses
Research and product development costs	232,717	284,885	486,787	539,941
Marketing and selling expenses	552,811	580,617	1,205,723	1,148,253
General and administrative costs	315,842	323,853	674,388	627,037
Rental operations expense	28,610	23,965	57,630	63,793
Total Operating Expenses	1,129,981	1,213,320	2,424,528	2,379,024
Operating Income	35,392	465,127	90,542	732,520
Interest Expense	(28,678)	(29,594)	(57,648)	(59,367)
Interest Income	6,234	2,973	(1,705)	3,220
Income from Operations Before Income Taxes	12,948	438,506	31,189	676,373
Income Tax (Benefit) Expense	(46,787)	980	(39,647)	253
Net Income	$ 59,735	$ 437,526	$ 70,836	$ 676,120
Basic Earnings Per Share	$ 0.00	$ 0.03	$ 0.00	$ 0.05
Diluted Earnings Per Share	$ 0.00	$ 0.03	$ 0.00	$ 0.05
Weighted Average Shares - Basic	14,472,849	14,442,211	14,466,892	14,441,921
Weighted Average Shares - Diluted	14,576,509	14,784,319	14,582,873	14,759,663