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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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