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Note 8 - Fair Value (Tables)

12 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

						Fair Value Measurements - September 30, 2024
						Quoted Prices in Active Markets				Significant Other Observable Inputs				Significant Unobservable Inputs
		Fair Value				Level 1				Level 2				Level 3
Assets:
Interest rate swaps		$	2,062,551			$	—			$	2,062,551			$	—
Total		$	2,062,551			$	—			$	2,062,551			$	—
Liabilities:
Natural gas purchases		$	761,020			$	—			$	761,020			$	—
Total		$	761,020			$	—			$	761,020			$	—

						Fair Value Measurements - September 30, 2023
						Quoted Prices in Active Markets				Significant Other Observable Inputs				Significant Unobservable Inputs
		Fair 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 - September 30, 2024
		Carrying				Quoted Prices in Active Markets				Significant Other Observable Inputs				Significant Unobservable Inputs
		Amount				Level 1				Level 2				Level 3
Liabilities:
Current maturities of long-term debt		$	800,000			$	—			$	—			$	800,000
Notes payable			136,955,000				—				—				135,471,275
Total		$	137,755,000			$	—			$	—			$	136,271,275

						Fair Value Measurements - September 30, 2023
		Carrying				Quoted Prices in Active Markets				Significant Other Observable Inputs				Significant Unobservable Inputs
		Amount				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

X

- 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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X

- 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

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Period Type:	duration

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration