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Note 9 - Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value Measurements - June 30, 2024 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Prices |  |  | Other |  |  | Significant |
|  |  |  |  |  | in Active |  |  | Observable |  |  | Unobservable |
|  | Fair |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 3,236,627 |  |  | $ | — |  |  | $ | 3,236,627 |  |  | $ | — |
Total |  | $ | 3,236,627 |  |  | $ | — |  |  | $ | 3,236,627 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas purchases |  | $ | 1,955,937 |  |  | $ | — |  |  | $ | 1,955,937 |  |  | $ | — |
Total |  | $ | 1,955,937 |  |  | $ | — |  |  | $ | 1,955,937 |  |  | $ | — |
|  | Fair Value Measurements - September 30, 2023 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Prices |  |  | Other |  |  | Significant |
|  |  |  |  |  | in Active |  |  | Observable |  |  | Unobservable |
|  | Fair |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 4,617,455 |  |  | $ | — |  |  | $ | 4,617,455 |  |  | $ | — |
Total |  | $ | 4,617,455 |  |  | $ | — |  |  | $ | 4,617,455 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas purchases |  | $ | 1,022,662 |  |  | $ | — |  |  | $ | 1,022,662 |  |  | $ | — |
Total |  | $ | 1,022,662 |  |  | $ | — |  |  | $ | 1,022,662 |  |  | $ | — |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Fair Value Measurements - June 30, 2024 |
|  |  |  |  |  | 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 |  | $ | 400,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 400,000 |
Notes payable |  |  | 136,615,000 |  |  |  | — |  |  |  | — |  |  |  | 132,886,828 |
Total |  | $ | 137,015,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 133,286,828 |
|  | Fair Value Measurements - September 30, 2023 |
|  |  |  |  |  | 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 |  | $ | 10,975,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,975,000 |
Notes payable |  |  | 126,100,000 |  |  |  | — |  |  |  | — |  |  |  | 120,298,658 |
Total |  | $ | 137,075,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 131,273,658 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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