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Note 6 - Line-of-credit - Available Borrowing Limits (Details) - USD ($) | Mar. 31, 2027 | Sep. 30, 2026 | Mar. 31, 2026 | Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Mar. 24, 2023
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Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 20,000,000 | $ 30,000,000 | $ 20,000,000 | $ 20,000,000
Line of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 20,000,000 |  |  |
Line of Credit [Member] | Forecast [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 30,000,000 | $ 20,000,000 | $ 30,000,000 |  |  |  |

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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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: 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(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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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: |