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Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Total contracts with customers $ 94,393,814 $ 82,414,016
Alternative revenue programs 3,045,951 1,751,206
Operating revenues 97,439,765 84,165,222
Oil and Gas [Member] | Residential [Member]    
Total contracts with customers 54,342,435 46,915,892
Oil and Gas [Member] | Commercial [Member]    
Total contracts with customers 33,083,485 28,874,522
Oil and Gas [Member] | Industrial and Transportation [Member]    
Total contracts with customers 5,730,726 5,671,884
Product and Service, Other [Member]    
Total contracts with customers 1,237,168 951,718
Gas Utility [Member]    
Total contracts with customers 94,279,356 82,284,438
Alternative revenue programs 3,045,951 1,751,206
Operating revenues 97,325,307 84,035,644
Gas Utility [Member] | Oil and Gas [Member] | Residential [Member]    
Total contracts with customers 54,342,435 46,915,892
Gas Utility [Member] | Oil and Gas [Member] | Commercial [Member]    
Total contracts with customers 33,083,485 28,874,522
Gas Utility [Member] | Oil and Gas [Member] | Industrial and Transportation [Member]    
Total contracts with customers 5,730,726 5,671,884
Gas Utility [Member] | Product and Service, Other [Member]    
Total contracts with customers 1,122,710 822,140
Non-utility [Member]    
Total contracts with customers 114,458 129,578
Alternative revenue programs 0 0
Operating revenues 114,458 129,578
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] | Industrial and Transportation [Member]    
Total contracts with customers 0 0
Non-utility [Member] | Product and Service, Other [Member]    
Total contracts with customers $ 114,458 $ 129,578