Income taxes - deferred tax asset and liability components (Details) - USD ($)	Feb. 28, 2025	Feb. 29, 2024
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

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- Definition

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from in-process research and development cost acquired in business combination or from joint venture formation or both.

+ 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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

+ References

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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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

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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