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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
May 31, 2017
May 31, 2016
Income Statement [Abstract]    
Net Sales $ 2,512,134 $ 2,240,211
Cost of Goods Sold 1,309,652 1,216,809
Gross Profit 1,202,482 1,023,402
Operating Expenses    
Research and product development costs 302,551 303,794
Marketing and selling expenses 582,902 546,983
General and administrative costs 258,782 269,189
Rental operations expense 39,098 43,117
Total Operating Expenses 1,183,333 1,163,083
Operating Income (Loss) 19,149 (139,681)
Interest Expense (12,213) (13,745)
Interest and Dividend Income 17,143 17,583
Other income 272 201,259
Income Before Income Taxes 24,351 65,416
Income Tax Expense 8,482 9,625
Net Income 15,869 55,791
Other Comprehensive Income    
Net unrealized gain (loss) on marketable securities 27,035 55,941
Comprehensive Income $ 42,904 $ 111,732
Basic Earnings (Loss) Per Share $ 0.00 $ 0.00
Diluted Earnings Per (Loss) Share $ 0.00 $ 0.00
Weighted Average Shares - Basic 14,961,076 14,961,076
Weighted Average Shares - Diluted 15,057,495 15,005,107