Schedule of Computation of basic and diluted earnings per share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share	$ 104,898	$ 376,169	$ 572,657	$ 1,986,745
Denominator for basic earnings per share – weighted average	15,738,180	15,622,721	15,733,284	15,541,247
Effects of dilutive securities
Stock options for employees and directors	35,190	32,215	31,067	31,177
Denominator for diluted earnings per share	15,773,370	15,654,936	15,764,351	15,572,424
Basic earnings per share	$ 0.01	$ 0.02	$ 0.04	$ 0.13
Diluted earnings per share	$ 0.01	$ 0.02	$ 0.04	$ 0.13