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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Income Statement [Abstract]        
Net Sales $ 3,155,258 $ 2,959,577 $ 8,673,849 $ 8,114,007
Cost of Goods Sold 1,858,970 1,517,414 4,761,919 4,162,819
Gross Profit 1,296,288 1,442,163 3,911,930 3,951,188
Operating Expenses        
Research and product development costs 324,969 324,324 978,733 941,497
Marketing and selling expenses 652,664 664,644 1,979,365 1,880,115
General and administrative costs 268,632 265,157 857,832 830,137
Total Operating Expenses 1,246,265 1,254,125 3,815,930 3,651,749
Operating Income 50,023 188,038 96,000 299,439
Interest Expense (9,684) (11,299) (30,501) (35,330)
Interest and Dividend Income 33,164 22,087 104,686 58,298
Realized gain (loss) on sale of marketable securities 19,791 119,075 11,207
Net unrealized loss on marketable securities (59,359) (189,016)  
Other income 8,681 16,193 28,196 23,785
Income Before Income Taxes 22,825 234,810 128,440 357,399
Income Tax Expense 2,566 40,368 27,627 92,443
Net Income 20,259 194,442 100,813 264,956
Other Comprehensive Income        
Net unrealized gain on marketable securities 51,499 111,137
Comprehensive Income $ 20,259 $ 245,941 $ 100,813 $ 376,093
Basic Earnings Per Share $ 0 $ 0.01 $ 0.01 $ 0.02
Diluted Earnings Per Share $ 0 $ 0.01 $ 0.01 $ 0.02
Weighted Average Shares - Basic 15,164,440 14,969,933 15,078,933 14,964,048
Weighted Average Shares - Diluted 15,386,094 15,113,389 15,284,071 15,073,576