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Note 3 - Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Gross deferred tax asset (liability) | $ 178,118 |  |
Gross deferred tax asset (liability) |  | $ (54,676) |
Valuation allowance |  | (47,014) | $ (104,858)
Net deferred tax asset (liability) | 178,118 |  |
Net deferred tax asset (liability) |  | (101,690) |
Long-term [Member] |  |  |
Intangibles | (86,319) | (75,190) |
Property and equipment depreciation | (419,896) | (521,586) |
Stock-based compensation | 169,730 | 114,118 |
Goodwill | (646,916) | (607,882) |
Short Term [Member] |  |  |
Net operating loss carry forwards and credits | 351,446 | 377,505 |
Inventories | 386,296 | 350,197 |
Prepaid expenses | (43,233) | (63,252) |
Accrued expenses and reserves | $ 467,010 | $ 371,414 |

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