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Income Taxes - Deferred tax asset and liability components (Details) - USD ($)	Feb. 29, 2020	Feb. 28, 2019
Deferred tax asset
Inventory	$ 41,000	$ 74,000
Allowance for accounts receivable	15,000	13,000
Accrued expenses and other	94,000	37,000
Research tax credits	27,000	208,000
Deferred tax asset - Long Term	177,000	332,000
Deferred tax liability
Intangible asset amortization		(25,000)
Building and leasehold depreciation	(252,000)	(346,000)
Deferred tax liability - Long Term	$ (252,000)	$ (371,000)

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