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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Income Statement [Abstract]        
Net Sales $ 3,032,457 $ 2,851,906 $ 8,890,027 $ 7,906,332
Cost of Goods Sold 1,566,338 1,452,217 4,561,173 4,056,590
Gross Profit 1,466,119 1,399,689 4,328,854 3,849,742
Operating Expenses        
Research and product development costs 303,484 249,292 918,421 740,122
Marketing and selling expenses 574,377 549,285 1,738,078 1,646,979
General and administrative costs 266,246 276,375 810,535 769,639
Rental operations expense 42,447 36,437 120,779 118,011
Total Operating Expenses 1,186,554 1,111,389 3,587,813 3,274,751
Operating Income 279,565 288,300 741,041 574,991
Interest Expense (14,331) (15,754) (44,395) (49,135)
Interest Income 14,640 8,260 41,035 17,977
Other (expense) income 4,823 (2,091) (49,637) 5,238
Income form Operations Before Income Taxes 284,697 278,715 688,044 549,071
Income Tax Expense 41,132 76,283 146,868 164,971
Net Income $ 243,565 $ 202,432 $ 541,176 $ 384,100
Basic Earnings Per Share $ 0.02 $ 0.01 $ 0.04 $ 0.03
Diluted Earnings Per Share $ 0.02 $ 0.01 $ 0.04 $ 0.03
Weighted Average Shares - Basic 14,946,274 14,718,162 14,941,150 14,713,893
Weighted Average Shares - Diluted 15,043,873 14,958,070 15,040,273 14,942,137