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Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Total contracts with customers	$ 26,844,675	$ 23,358,024
Alternative revenue programs	444,811	1,061,328
Revenue	27,289,486	24,419,352
Oil and Gas [Member] | Residential [Member]
Total contracts with customers	15,821,884	13,824,642
Oil and Gas [Member] | Commercial [Member]
Total contracts with customers	9,244,995	7,841,726
Oil and Gas [Member] | Transportation and Interruptible [Member]
Total contracts with customers	1,505,703	1,370,270
Product and Service, Other [Member]
Total contracts with customers	272,093	321,386
Gas Utility [Member]
Total contracts with customers	26,818,393	23,330,526
Alternative revenue programs	444,811	1,061,328
Revenue	27,263,204	24,391,854
Gas Utility [Member] | Oil and Gas [Member] | Residential [Member]
Total contracts with customers	15,821,884	13,824,642
Gas Utility [Member] | Oil and Gas [Member] | Commercial [Member]
Total contracts with customers	9,244,995	7,841,726
Gas Utility [Member] | Oil and Gas [Member] | Transportation and Interruptible [Member]
Total contracts with customers	1,505,703	1,370,270
Gas Utility [Member] | Product and Service, Other [Member]
Total contracts with customers	245,811	293,888
Non-utility [Member]
Total contracts with customers	26,282	27,498
Alternative revenue programs	0	0
Revenue	26,282	27,498
Non-utility [Member] | Oil and Gas [Member] | Residential [Member]
Total contracts with customers	0	0
Non-utility [Member] | Oil and Gas [Member] | Commercial [Member]
Total contracts with customers	0	0
Non-utility [Member] | Oil and Gas [Member] | Transportation and Interruptible [Member]
Total contracts with customers	0	0
Non-utility [Member] | Product and Service, Other [Member]
Total contracts with customers	$ 26,282	$ 27,498

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