Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Total contracts with customers	$ 93,894,115	$ 80,533,657
Alternative revenue programs	1,440,097	4,107,575
Revenue	95,334,212	84,641,232
Oil and Gas [Member] | Residential [Member]
Total contracts with customers	54,093,809	46,472,676
Oil and Gas [Member] | Commercial [Member]
Total contracts with customers	33,035,454	27,659,507
Oil and Gas [Member] | Transportation and Interruptible [Member]
Total contracts with customers	5,871,389	5,414,157
Product and Service, Other [Member]
Total contracts with customers	893,463	987,317
Gas Utility [Member]
Total contracts with customers	93,791,846	80,425,526
Alternative revenue programs	1,440,097	4,107,575
Revenue	95,231,943	84,533,101
Gas Utility [Member] | Oil and Gas [Member] | Residential [Member]
Total contracts with customers	54,093,809	46,472,676
Gas Utility [Member] | Oil and Gas [Member] | Commercial [Member]
Total contracts with customers	33,035,454	27,659,507
Gas Utility [Member] | Oil and Gas [Member] | Transportation and Interruptible [Member]
Total contracts with customers	5,871,389	5,414,157
Gas Utility [Member] | Product and Service, Other [Member]
Total contracts with customers	791,194	879,186
Non-utility [Member]
Total contracts with customers	102,269	108,131
Alternative revenue programs	0	0
Revenue	102,269	108,131
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	$ 102,269	$ 108,131