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Note 6 - Line-of-credit - Available Borrowing Limits (Details) - USD ($) | Dec. 31, 2023 | Oct. 01, 2023 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Available Line of Credit |  |  | $ 13,000,000 | $ 28,000,000
Line of Credit [Member] |  |  |  |
Available Line of Credit |  |  | $ 13,000,000 |
Line of Credit [Member] | Forecast [Member] |  |  |  |
Available Line of Credit | $ 25,000,000 | $ 22,000,000 |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |