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Income taxes - deferred tax asset and liability components (Details) - USD ($) | Feb. 28, 2025 | Feb. 29, 2024
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Income Tax Disclosure [Abstract] |  |
Allowance for inventory | $ 92,000 | $ 91,000
Allowance for accounts receivable | 3,000 | 3,000
Capitalized R&D expenses – IRC Section 174 | 1,277,000 | 985,000
Accrued expenses and other | 154,000 | 177,000
Research & Development tax credits - Massachusetts | 383,000 | 303,000
Sub-total deferred tax asset | 1,909,000 | 1,559,000
Less valuation allowance – Massachusetts R&D tax credits | (383,000) | (303,000)
Deferred tax asset – Long Term | 1,526,000 | 1,256,000
Building and leasehold depreciation | (132,000) | (230,000)
Deferred tax liability – Long Term | $ (132,000) | $ (230,000)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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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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