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Income Taxes - Deferred tax asset and liability components (Details) - USD ($)	Feb. 28, 2021	Feb. 29, 2020
Deferred tax asset
Inventory	$ 66,000	$ 41,000
Allowance for accounts receivable	13,000	15,000
Accrued expenses and other	181,000	94,000
Research tax credits		27,000
Deferred tax asset - Long Term	260,000	177,000
Deferred tax liability
Building and leasehold depreciation	(206,000)	(252,000)
Deferred tax liability - Long Term	$ (206,000)	$ (252,000)

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