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Income Taxes - Deferred tax asset and liability components (Details) - USD ($) | Feb. 28, 2019 | Feb. 28, 2018
--- | --- | ---
Deferred tax asset |  |
Inventory | $ 74,000 | $ 186,800
Allowance for accounts receivable | 13,000 | 18,100
Accrued expenses and other | 37,000 | 111,200
Research tax credits | 208,000 | 208,300
Valuation allowance |  | (4,600)
Deferred tax asset - Long Term | 332,000 | 396,400
Deferred tax liability |  |
Intangible asset amortization | (25,000) | (25,000)
Building and leasehold depreciation | (346,000) | (360,400)
Deferred tax liability - Long Term | $ (371,000) | $ (385,400)

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