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Income Taxes - Net deferred tax asset components (Details) - USD ($)	Feb. 28, 2017	Feb. 29, 2016
Income Tax Disclosure [Abstract]
Inventory	$ 253,500	$ 87,000
Allowance for accounts receivable	18,100	18,000
Accrued expenses and other	43,500	50,000
Deferred tax asset - Current	315,100	155,000
Research tax credits	143,000	102,000
Accrued expenses	13,000	15,000
Intangible asset amortization	(30,000)	(39,000)
Building and leasehold depreciation	(464,000)	(250,000)
Deferred tax liability - Long Term	$ (338,000)	$ (172,000)

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