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Earnings Per Share - Computation of basic and diluted earnings per share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share	$ 376,169	$ 320,478	$ 1,986,745	$ 666,169
Denominator for basic earnings per share – weighted average	15,622,721	15,440,673	15,541,247	15,420,787
Effects of dilutive securities
Stock options for employees and directors	32,215	142,416	31,177	126,817
Denominator for diluted earnings per share	15,654,936	15,583,089	15,572,424	15,547,604
Basic earnings per share	$ 0.02	$ 0.02	$ 0.13	$ 0.04
Diluted earnings per share	$ 0.02	$ 0.02	$ 0.13	$ 0.04

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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