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Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) - USD ($)	Mar. 31, 2024	Sep. 30, 2023
Regulatory liabilities	$ 1,621,966	$ 1,632,716
Asset retirement obligations	10,941,196	10,792,831
Regulatory cost of retirement obligations	13,738,423	13,029,376
Regulatory Liability, Noncurrent	17,735,810	18,031,693
Total non-current	42,415,429	41,853,900
Total regulatory liabilities	44,037,395	43,486,616
Over-recovery of Gas Cost [Member]
Regulatory liabilities	780,133	0
Revenue Subject to Refund [Member]
Regulatory liabilities	161,219	146,861
Rate Refund [Member]
Regulatory liabilities	0	652,018
Deferred Income Tax Charge [Member]
Regulatory liabilities	591,765	527,034
Regulatory Liability, Noncurrent	15,953,893	16,249,776
Supplier Refund [Member]
Regulatory liabilities	73,268	275,649
Other Deferred Liabilities [Member]
Regulatory liabilities	15,581	31,154
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liability, Noncurrent	$ 1,781,917	$ 1,781,917

X

- Definition

Regulatory cost of retirement obligations not otherwise included in ARO.

+ References

No definition available.

+ Details

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X

- Definition

The amount of regulatory liabilities and asset retirement obligations classified as noncurrent.

+ References

No definition available.

+ Details

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- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

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- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

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- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ 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(24))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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