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Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Total contracts with customers $ 23,358,024 $ 33,424,584
Alternative revenue programs 1,061,328 (142,249)
Operating revenues 24,419,352 33,282,335
Oil and Gas [Member] | Residential [Member]    
Total contracts with customers 13,824,642 19,365,840
Oil and Gas [Member] | Commercial [Member]    
Total contracts with customers 7,841,726 12,019,113
Oil and Gas [Member] | Transportation and Interruptible [Member]    
Total contracts with customers 1,370,270 1,588,068
Product and Service, Other [Member]    
Total contracts with customers 321,386 451,563
Gas Utility [Member]    
Total contracts with customers 23,330,526 33,395,016
Alternative revenue programs 1,061,328 (142,249)
Operating revenues 24,391,854 33,252,767
Gas Utility [Member] | Oil and Gas [Member] | Residential [Member]    
Total contracts with customers 13,824,642 19,365,840
Gas Utility [Member] | Oil and Gas [Member] | Commercial [Member]    
Total contracts with customers 7,841,726 12,019,113
Gas Utility [Member] | Oil and Gas [Member] | Transportation and Interruptible [Member]    
Total contracts with customers 1,370,270 1,588,068
Gas Utility [Member] | Product and Service, Other [Member]    
Total contracts with customers 293,888 421,995
Non-utility [Member]    
Total contracts with customers 27,498 29,568
Alternative revenue programs 0 0
Operating revenues 27,498 29,568
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 $ 27,498 $ 29,568