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Note 16 - Leases (Details Textual)	3 Months Ended	9 Months Ended
	Dec. 31, 2023	Jun. 30, 2024 USD ($)
Number of Additional Operating Leases	3
Operating Lease, Right-of-Use Asset		$ 339,022
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Miscellaneous, Noncurrent
Operating Lease, Liability, Current		$ 31,366
Operating Lease, Liability, Noncurrent		$ 317,482
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Liabilities, Other than Long-Term Debt, Noncurrent
Three Other Operating Leases [Member]
Operating Lease, Cost		$ 50,000
Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	3 years
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	6 years
RNG [Member]
Lessee, Operating Lease, Term of Contract (Year)	20 years
Lessee, Operating Lease, Renewal Term (Year)	5 years

X

- Definition

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+ References

No definition available.

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
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-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

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X

- Definition

Indicates line item in statement of financial position that includes current operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-2

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
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-Paragraph 1
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-Publisher FASB
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- Definition

Indicates line item in statement of financial position that includes noncurrent operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
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-URI https://asc.fasb.org/1943274/2147479041/842-20-45-2

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Indicates line item in statement of financial position that includes operating lease right-of-use asset.

+ References

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