Note 4 - Income Taxes (Details Textual) - USD ($) |
12 Months Ended | |
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Sep. 30, 2021 |
Sep. 30, 2020 |
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Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 37,018,000 | $ 31,119,000 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 36,033,000 | 30,737,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Other | 2,740 | 3,152 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 946,158 | 928,734 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 1,626,000 | 1,459,000 |
Expire In 2026 [Member] | ||
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 21,750,000 | |
Expire In 2028 [Member] | ||
Deferred Tax Assets, Tax Credit Carryforwards, Other | 15,268,000 | 9,369,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 643,000 | 557,000 |
Expire In 2023 [Member] | ||
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 384,000 | $ 345,000 |
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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