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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
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

X

- 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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

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