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Note 6 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Accrued Income Taxes, Current | $ 84,000 | $ 84,000 | $ 1,791,000 |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards | 0 | $ 0 | 0 |
Open Tax Year |  | 2017 2018 2019 2020 2021 2022 2023 |  |
Foreign Tax Authority [Member] | Finnish Tax Administration [Member] |  |  |  |
Operating Loss Carryforwards | $ 1,000 | $ 1,000 | 4,000 |
Foreign Tax Authority [Member] | Finnish Tax Administration [Member] | Nestor Cables [Member] |  |  |  |
Open Tax Year | 2018 2019 2020 2021 2022 2023 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Open Tax Year |  | 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount | $ 255,000 | $ 255,000 | $ 292,000 |
State and Local Jurisdiction [Member] | Research and Development and Alternative Minimum Tax Credit Carryforwards [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  | $ 0

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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