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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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