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Fair Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value [Member] - USD ($) | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Quoted Prices in Active Markets (Level 1) [Member] |  |
Liabilities: |  |
Total | $ 0 | $ 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Liabilities: |  |
Total | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Total | 117,181,480 | 100,900,952
Recurring [Member] |  |
Liabilities: |  |
Natural gas purchases | 316,120 | 397,757
Total | 2,494,492 | 1,292,098
Recurring [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Interest rate swap | 2,178,372 | 894,341
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |
Liabilities: |  |
Natural gas purchases | 0 | 0
Total | 0 | 0
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Interest rate swap | 0 | 0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Liabilities: |  |
Natural gas purchases | 316,120 | 397,757
Total | 2,494,492 | 1,292,098
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Interest rate swap | 2,178,372 | 894,341
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Natural gas purchases | 0 | 0
Total | 0 | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Interest rate swap | $ 0 | $ 0

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- Definition Fair market value estimated at the corresponding first of month index prices for which the obligation, the timing difference between the payment for natural gas purchases and the actual receipt of such purchases under the current asset management contract, is expected to be settled. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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