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Note 2 - Revenue (Tables)

12 Months Ended

Sep. 30, 2025

Notes Tables

Disaggregation of Revenue [Table Text Block]

		*2025*
		*Gas utility*				*Non utility*				*Total operating revenues*
Natural Gas (Billed and Unbilled):
Residential		$	54,093,809			$	—			$	54,093,809
Commercial			33,035,454				—				33,035,454
Transportation and Interruptible			5,871,389				—				5,871,389
Other			791,194				102,269				893,463
Total contracts with customers			93,791,846				102,269				93,894,115
Alternative revenue programs			1,440,097				—				1,440,097
Total operating revenues		$	95,231,943			$	102,269			$	95,334,212

		*2024*
		*Gas utility*				*Non utility*				*Total operating revenues*
Natural Gas (Billed and Unbilled):
Residential		$	46,472,676			$	—			$	46,472,676
Commercial			27,659,507				—				27,659,507
Transportation and Interruptible			5,414,157				—				5,414,157
Other			879,186				108,131				987,317
Total contracts with customers			80,425,526				108,131				80,533,657
Alternative revenue programs			4,107,575				—				4,107,575
Total operating revenues		$	84,533,101			$	108,131			$	84,641,232

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*
September 30, 2024		$	3,080,140			$	1,294,798			$	1,915,859			$	1,488,113
September 30, 2025			3,354,154				1,373,512				1,891,161				1,537,311
Increase (decrease)		$	274,014			$	78,714			$	(24,698	)		$	49,198