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Note 9 - Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2025

Notes Tables

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

		Fair Value Measurements - June 30, 2025
						Quoted				Significant
						Prices				Other				Significant
						in Active				Observable				Unobservable
		Fair				Markets				Inputs				Inputs
		Value				(Level 1)				(Level 2)				(Level 3)
Assets:
Interest rate swaps		$	1,535,068			$	—			$	1,535,068			$	—
Total		$	1,535,068			$	—			$	1,535,068			$	—
Liabilities:
Natural gas purchases		$	775,477			$	—			$	775,477			$	—
Total		$	775,477			$	—			$	775,477			$	—

		Fair Value Measurements - September 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		$	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, by Balance Sheet Grouping [Table Text Block]

		Fair Value Measurements - June 30, 2025
						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		$	2,534,514			$	—			$	—			$	2,534,514
Notes payable			134,965,486				—				—				131,790,067
Total		$	137,500,000			$	—			$	—			$	134,324,581

		Fair Value Measurements - September 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		$	800,000			$	—			$	—			$	800,000
Notes payable			136,955,000				—				—				135,471,275
Total		$	137,755,000			$	—			$	—			$	136,271,275

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://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 10
-Topic 825
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-13

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-URI https://asc.fasb.org/1943274/2147482907/825-10-50-12

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-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

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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

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