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Income taxes - deferred tax asset and liability components (Details) - USD ($) | Feb. 29, 2024 | Feb. 28, 2023
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Income Tax Disclosure [Abstract] |  |
Allowance for inventory | $ 91,000 | $ 76,000
Allowance for accounts receivable | 3,000 | 3,000
Capitalized R&D expenses - IRC Section 174 | 985,000 | 441,000
Accrued expenses and other | 177,000 | 147,000
Deferred tax asset - Long Term | 1,256,000 | 667,000
Building and leasehold depreciation | (230,000) | (83,000)
Deferred tax liability - Long Term | $ (230,000) | $ (83,000)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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