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Note 2 - Revenue (Tables)

9 Months Ended

Jun. 30, 2025

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended June 30, 2025												Three Months Ended June 30, 2024
		Gas utility				Non utility				Total operating revenues				Gas utility				Non utility				Total operating revenues
Natural Gas (Billed and Unbilled):
Residential		$	8,677,898			$	—			$	8,677,898			$	7,333,332			$	—			$	7,333,332
Commercial			6,284,281				—				6,284,281				4,706,086				—				4,706,086
Transportation and interruptible			1,472,948				—				1,472,948				1,317,890				—				1,317,890
Other			148,576				25,065				173,641				168,514				26,823				195,337
Total contracts with customers			16,583,703				25,065				16,608,768				13,525,822				26,823				13,552,645
Alternative revenue programs			655,847				—				655,847				905,557				—				905,557
Total operating revenues		$	17,239,550			$	25,065			$	17,264,615			$	14,431,379			$	26,823			$	14,458,202

		Nine Months Ended June 30, 2025												Nine Months Ended June 30, 2024
		Gas utility				Non utility				Total operating revenues				Gas utility				Non utility				Total operating revenues
Natural Gas (Billed and Unbilled):
Residential		$	47,091,604			$	—			$	47,091,604			$	40,001,039			$	—			$	40,001,039
Commercial			27,740,237				—				27,740,237				22,946,163				—				22,946,163
Transportation and interruptible			4,454,693				—				4,454,693				4,047,151				—				4,047,151
Other			547,686				77,508				625,194				653,571				81,366				734,937
Total contracts with customers			79,834,220				77,508				79,911,728				67,647,924				81,366				67,729,290
Alternative revenue programs			1,104,470				—				1,104,470				3,807,640				—				3,807,640
Total operating revenues		$	80,938,690			$	77,508			$	81,016,198			$	71,455,564			$	81,366			$	71,536,930

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

		Current Assets								Current Liabilities
		Trade accounts receivable(1)				Unbilled revenue(1)				Customer credit balances				Customer deposits
Balance at September 30, 2024		$	3,080,140			$	1,294,798			$	1,915,859			$	1,488,113
Balance at June 30, 2025			4,723,496				1,341,438				1,013,910				1,492,550
Increase (decrease)		$	1,643,356			$	46,640			$	(901,949	)		$	4,437

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

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- References

No definition available.

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