Note 3 - Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|---|---|---|---|
| Intangibles | $ (91,924) | $ (86,319) | |
| Property and equipment depreciation | (379,572) | (419,896) | |
| Net operating loss carry forwards and credits | 300,032 | 351,446 | |
| Stock-based compensation | 230,553 | 169,730 | |
| Inventories | 518,526 | 386,296 | |
| Prepaid expenses | (48,505) | (43,233) | |
| Accrued expenses and reserves | 519,408 | 467,010 | |
| Goodwill | (683,051) | (646,916) | |
| Gross deferred tax asset (liability) | 365,467 | 178,118 | |
| Valuation allowance | 0 | 0 | $ (47,014) |
| Net deferred tax asset (liability) | $ 365,467 | $ 178,118 |
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax assets (liabilities) attributable to temporary differences. No definition available.
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax assets (liabilities) attributable to temporary differences. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from goodwill. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses. No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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