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Note 8 - Fair Value (Tables)

12 Months Ended

Sep. 30, 2025

Notes Tables

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

						Fair Value Measurements - September 30, 2025
						Quoted Prices in Active Markets				Significant Other Observable Inputs				Significant Unobservable Inputs
		Fair Value				Level 1				Level 2				Level 3
Assets:
Interest rate swaps - current		$	828,573			$	—			$	828,573			$	—
Interest rate swaps - noncurrent		$	421,511				—			$	421,511
Total		$	1,250,084			$	—			$	1,250,084			$	—
Liabilities:
Natural gas purchases		$	135,863			$	—			$	135,863			$	—
Interest rate swaps - current		$	57,144			$	—			$	57,144			$	—
Interest rate swaps - noncurrent		$	298,016			$	—			$	298,016			$	—
Total		$	491,023			$	—			$	491,023			$	—

						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 - current		$	871,026			$	—			$	871,026			$	—
Interest rate swaps - noncurrent		$	1,191,526			$	—			$	1,191,526			$	—
Total		$	2,062,552			$	—			$	2,062,552			$	—
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 - September 30, 2025
		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		$	2,846,018			$	—			$	—			$	2,846,018
Notes payable			134,258,197				—				—				131,605,756
Total		$	137,104,215			$	—			$	—			$	134,451,774

						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

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

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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)
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