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Note 5 - Other Investments (Details Textual) - USD ($)	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Proceeds from Equity Method Investment, Distribution	$ 2,658,656	$ 0
RGC Midstream LLC [Member] | MVP Southgate Investment [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner	1.00%
Proceeds from Equity Method Investment, Distribution	$ 2,700,000
RGC Midstream LLC [Member] | MVP [Member]
Equity Method Investment, Ownership Percentage	1.00%

X

- Definition

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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