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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Income Statement [Abstract]        
Net Sales $ 2,817,731 $ 2,653,696 $ 5,518,591 $ 5,154,430
Cost of Goods Sold 1,473,286 1,325,188 2,902,949 2,645,405
Gross Profit 1,344,445 1,328,508 2,615,642 2,509,025
Operating Expenses        
Research and product development costs 319,898 307,923 653,764 617,173
Marketing and selling expenses 696,913 627,674 1,326,701 1,215,471
General and administrative costs 313,808 302,590 589,200 564,980
Total Operating Expenses 1,330,619 1,238,187 2,569,665 2,397,624
Operating Income 13,826 90,321 45,977 111,401
Interest Expense (10,203) (11,818) (20,817) (24,031)
Interest and Dividend Income 36,916 19,068 71,522 36,211
Realized gain (loss) on sale of marketable securities 89,683 (8,584) 119,075 (8,584)
Net unrealized loss on marketable securities (80,596)   (129,657)  
Other income (expense) 16,995 9,251 19,515 7,592
Income Before Income Taxes 66,621 98,238 105,615 122,589
Income Tax Expense 7,497 43,593 25,061 52,075
Net Income 59,124 54,645 80,554 70,514
Other Comprehensive Income        
Net unrealized gain on marketable securities   32,603   59,638
Comprehensive Income $ 59,124 $ 87,248 $ 80,554 $ 130,152
Basic Earnings Per Share $ 0 $ 0 $ 0.01 $ 0
Diluted Earnings Per Share $ 0 $ 0 $ 0.01 $ 0
Weighted Average Shares - Basic 15,085,660 14,961,197 15,036,644 14,961,137
Weighted Average Shares - Diluted 15,224,221 15,064,631 15,169,210 15,060,026