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Income Taxes - Income tax reconciliation (Details) - USD ($)	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Income tax (benefit) reconciliation:
Expected federal income tax	$ 64,165	$ 252,321
State tax, net of federal	10,002	39,059
Research and development tax credits	(70,827)	(135,904)
Overaccrual of prior year taxes	(63,351)	(67,579)
Deferred tax expense	(5,080)	106,826
Permanent timing difference	17,795
Other adjustments	27,922
Income tax	$ (19,374)	$ 194,723

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