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Note 14 - Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value Measurements - March 31, 2022 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Prices |  |  | Other |  |  | Significant |
|  |  |  |  |  | in Active |  |  | Observable |  |  | Unobservable |
|  | Fair |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 1,359,498 |  |  | $ | — |  |  | $ | 1,359,498 |  |  | $ | — |
Total |  | $ | 1,359,498 |  |  | $ | — |  |  | $ | 1,359,498 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas purchases |  | $ | 1,355,281 |  |  | $ | — |  |  | $ | 1,355,281 |  |  | $ | — |
Total |  | $ | 1,355,281 |  |  | $ | — |  |  | $ | 1,355,281 |  |  | $ | — |
|  | Fair Value Measurements - September 30, 2021 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Prices |  |  | Other |  |  | Significant |
|  |  |  |  |  | in Active |  |  | Observable |  |  | Unobservable |
|  | Fair |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas purchases |  | $ | 2,728,935 |  |  | $ | — |  |  | $ | 2,728,935 |  |  | $ | — |
Interest rate swaps |  |  | 1,196,083 |  |  |  | — |  |  |  | 1,196,083 |  |  |  | — |
Total |  | $ | 3,925,018 |  |  | $ | — |  |  | $ | 3,925,018 |  |  | $ | — |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
| Fair Value Measurements - March 31, 2022
|  |  |  | Quoted |  | Significant |  |  |
|  |  |  | Prices |  | Other |  | Significant
|  |  |  | in Active |  | Observable |  | Unobservable
| Carrying |  | Markets |  | Inputs |  | Inputs
| Value |  | (Level 1) |  | (Level 2) |  | (Level 3)
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt | $ | 19,705,200 |  | $ | — |  | $ | — |  | $ | 19,765,421
Notes payable |  | 105,125,000 |  |  | — |  |  | — |  |  | 107,952,588
Total | $ | 124,830,200 |  | $ | — |  | $ | — |  | $ | 127,718,009
|  | Fair Value Measurements - September 30, 2021 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Prices |  |  | Other |  |  | Significant |
|  |  |  |  |  | in Active |  |  | Observable |  |  | Unobservable |
|  | Carrying |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt |  | $ | 7,000,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,000,000 |
Notes payable |  |  | 116,110,200 |  |  |  | — |  |  |  | — |  |  |  | 124,691,896 |
Total |  | $ | 123,110,200 |  |  | $ | — |  |  | $ | — |  |  | $ | 131,691,896 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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