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Income Taxes - Deferred tax assets and liabilities component (Details) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | --- | ---
Deferred tax assets: |  |  |
Reserves and accruals | $ 651,321 | $ 654,624 | $ 698,233
Research and development credit |  | 1,327,162 | 1,589,247
NOL carryforwards -fed/state | 984,004 | 1,612,043 | 2,192,018
Depreciation |  |  | (807,522)
Stock options | 45,069 | 41,652 | 5,296
Gross deferred tax assets | 1,680,394 | 3,635,481 | 3,677,272
Less: Valuation allowance | (981,816) | (1,449,204) | (3,471,164)
Total deferred tax assets | 698,578 | 2,186,277 | 206,108
Deferred tax liabilities: |  |  |
Depreciation | (652,091) | (1,122,455) | (335,797)
Total deferred tax liabilities | (652,091) | (1,122,455) | (335,797)
Net deferred tax asset (liability) | $ 46,487 | $ 1,063,822 | $ (129,689)

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- Definition Represents the non-current portion of deferred tax assets attributable to federal and state operating loss carryforwards, before allocation of valuation allowances. + References No definition available. + Details
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- Definition Represents the noncurrent portion of deferred tax assets attributable to research and development tax credit carryforwards, before allocation of valuation allowances. + References No definition available. + Details
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