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Consolidated Statements of Income (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Income Statement [Abstract]        
Net Sales $ 2,944,772 $ 2,587,818 $ 9,083,801 $ 7,303,606
Cost of Goods Sold 1,438,652 1,296,610 4,466,134 3,779,098
Gross Profit 1,506,120 1,291,208 4,617,667 3,524,508
Operating Expenses        
Research and product development costs 277,269 191,787 817,212 590,136
Marketing and selling expenses 665,988 596,809 1,814,240 1,630,063
General and administrative costs 301,923 288,501 928,962 864,727
Real estate operations expense 36,535    100,328   
Total Operating Expenses 1,281,715 1,077,097 3,660,742 3,084,926
Operating Income 224,405 214,111 956,925 439,582
Interest Expense (29,528) (570) (88,895) (6,405)
Interest Income 1,694 381 4,914 1,601
Income from Operations Before Income Taxes 196,571 213,922 872,944 434,778
Income Tax Expense (Benefit) 768    1,021 216
Net Income $ 195,803 $ 213,922 $ 871,923 $ 434,562
Basic Earnings Per Share $ 0.01 $ 0.02 $ 0.06 $ 0.03
Diluted Earnings Per Share $ 0.01 $ 0.01 $ 0.06 $ 0.03
Weighted Average Shares - Basic 14,442,211 14,440,192 14,441,743 14,438,398
Weighted Average Shares - Diluted 14,483,245 15,233,760 14,540,733 15,250,807