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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
Income Statement [Abstract]        
Net Sales $ 2,982,377 $ 2,599,104 $ 8,169,007 $ 7,149,766
Cost of Goods Sold 1,507,500 1,359,704 4,132,799 3,861,651
Gross Profit 1,474,877 1,239,400 4,036,208 3,288,115
Operating Expenses        
Research and product development costs 318,037 307,645 922,460 924,056
Marketing and selling expenses 660,050 575,737 1,866,204 1,654,806
General and administrative costs 261,772 265,805 819,886 767,412
Rental operations expense 36,648 36,007 111,017 117,578
Total Operating Expenses 1,276,507 1,185,194 3,719,567 3,463,852
Operating Income (Loss) 198,370 54,206 316,641 (175,737)
Interest Expense (11,299) (12,848) (35,330) (39,960)
Interest and Dividend Income 22,087 15,038 58,298 48,142
Other income 25,652 5,946 17,790 208,015
Income from Operations Before Income Taxes 234,810 62,342 357,399 40,460
Income Tax Expense 40,368   92,443 12,000
Net Income 194,442 62,342 264,956 28,460
Other Comprehensive Income        
Net unrealized gain (loss) on marketable securities 51,499 (31,275) 111,137 61,097
Comprehensive Income $ 245,941 $ 31,067 $ 376,093 $ 89,557
Basic Earnings (Loss) Per Share $ 0.01 $ 0 $ 0.02 $ 0
Diluted Earnings (Loss) Per Share $ 0.01 $ 0 $ 0.02 $ 0
Weighted Average Shares - Basic 14,969,933 14,961,076 14,964,048 14,961,076
Weighted Average Shares - Diluted 15,113,389 15,038,794 15,073,576 15,015,370