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Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($)
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Total contracts with customers $ 22,166,551 $ 18,654,609
Alternative Revenue Programs 1,096,529 862,408
Total operating revenues 23,263,080 19,517,017
Oil and Gas [Member] | Residential [Member]    
Total contracts with customers 13,212,489 11,246,194
Oil and Gas [Member] | Commercial [Member]    
Total contracts with customers 7,385,718 5,990,020
Oil and Gas [Member] | Industrial and Transportation [Member]    
Total contracts with customers 1,313,091 1,223,801
Product and Service, Other [Member]    
Total contracts with customers 255,253 194,594
Gas Utility [Member]    
Total contracts with customers 22,135,126 18,621,092
Alternative Revenue Programs 1,096,529 862,408
Total operating revenues 23,231,655 19,483,500
Gas Utility [Member] | Oil and Gas [Member] | Residential [Member]    
Total contracts with customers 13,212,489 11,246,194
Gas Utility [Member] | Oil and Gas [Member] | Commercial [Member]    
Total contracts with customers 7,385,718 5,990,020
Gas Utility [Member] | Oil and Gas [Member] | Industrial and Transportation [Member]    
Total contracts with customers 1,313,091 1,223,801
Gas Utility [Member] | Product and Service, Other [Member]    
Total contracts with customers 223,828 161,077
Non-utility [Member]    
Total contracts with customers 31,425 33,517
Alternative Revenue Programs 0 0
Total operating revenues 31,425 33,517
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 $ 31,425 $ 33,517