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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Income Statement [Abstract]
Net Sales	$ 3,672,286	$ 3,155,258	$ 9,840,536	$ 8,673,849
Cost of Goods Sold	1,875,606	1,858,970	5,191,929	4,761,919
Gross Profit	1,796,680	1,296,288	4,648,607	3,911,930
Operating Expenses
Research and product development costs	361,429	324,969	1,020,299	978,733
Marketing and selling expenses	849,419	652,664	2,326,115	1,979,365
General and administrative costs	316,218	268,632	935,693	857,832
Total Operating Expenses	1,527,066	1,246,265	4,282,107	3,815,930
Operating Income	269,614	50,023	366,500	96,000
Interest Expense	(8,000)	(9,684)	(25,465)	(30,501)
Interest and Dividend Income	20,513	33,164	77,496	104,686
Realized gain on sale of marketable securities				119,075
Net unrealized loss on marketable securities		(59,359)		(189,016)
Other income	7,527	8,681	24,404	28,196
Income Before Income Taxes	289,654	22,825	442,935	128,440
Income Tax Expense	10,000	2,566	23,303	27,627
Net Income	$ 279,654	$ 20,259	$ 419,632	$ 100,813
Basic Earnings Per Share	$ 0.02	$ 0	$ 0.03	$ 0.01
Diluted Earnings Per Share	$ 0.02	$ 0	$ 0.03	$ 0.01
Weighted Average Shares - Basic	15,306,008	15,164,440	15,291,968	15,078,933
Weighted Average Shares - Diluted	15,371,819	15,386,094	15,354,472	15,284,071

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration