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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) | Mar. 31, 2020 | Sep. 30, 2019
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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

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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