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Income Taxes - Income tax reconciliation (Details) - USD ($)	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
Income tax (benefit) reconciliation:
Expected federal income tax	$ 38,101	$ 156,421
State tax, net of federal	11,430	24,383
Research and development tax credits	(19,588)	(57,994)
Under (Overaccrual) of prior year state taxes		40,793
Change in recapture tax rate from 39.3% to 27.3%		15,343
Permanent timing difference	2,272	33,107
Change in valuation allowances	(36,425)	(159,300)
Other adjustments	24,057	39,103
Income tax expense (benefit)	$ 19,847	$ 91,856

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