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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
May 31, 2019
May 31, 2018
Income Statement [Abstract]    
Net Sales $ 2,822,428 $ 2,700,860
Cost of Goods Sold 1,517,493 1,429,663
Gross Profit 1,304,935 1,271,197
Operating Expenses    
Research and product development costs 337,173 333,866
Marketing and selling expenses 677,412 629,788
General and administrative costs 285,813 275,392
Total Operating Expenses 1,300,398 1,239,046
Operating Income 4,537 32,151
Interest Expense (8,947) (10,614)
Interest and Dividend Income 31,171 34,606
Realized gain (loss) on sale of marketable securities 29,392
Net unrealized loss on marketable securities (49,061)
Other income 4,755 2,520
Income Before Income Taxes 31,516 38,994
Income Tax Expense 6,303 17,564
Net Income $ 25,213 $ 21,430
Basic Earnings Per Share $ 0.00 $ 0.00
Diluted Earnings Per Share $ 0.00 $ 0.00
Weighted Average Shares - Basic 15,268,071 14,987,613
Weighted Average Shares - Diluted 15,357,295 15,088,512