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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($)
Mar. 31, 2020
Sep. 30, 2019
Regulatory Liabilities [Line Items]    
Current regulatory liabilities $ 2,986,791 $ 4,877,603
Deferred Credits and Other Liabilities:    
Asset retirement obligations 6,943,766 6,788,683
Regulatory cost of retirement obligations 12,303,970 11,892,352
Noncurrent regulatory liabilities - excess deferred income taxes 10,767,006 10,934,434
Total non-current 30,014,742 29,615,469
Total regulatory liabilities 33,001,533 34,493,072
Over-recovery of gas costs    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 2,217,721 161,837
Over-recovery of SAVE Plan revenues    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 397,581 574,181
Rate Refund    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 0 3,827,588
Excess deferred income taxes    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 205,353 205,353
Other deferred liabilities    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities $ 166,136 $ 108,644