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Note 14 - Leases (Details Textual)
12 Months Ended
Sep. 30, 2023
USD ($)
Number of Additional Operating Leases 3
Three Other Operating Leases [Member]  
Operating Lease, Cost $ 50,000
Other Noncurrent Assets [Member]  
Operating Lease, Right-of-Use Asset 361,724
Other Current Liabilities [Member]  
Operating Lease, Liability, Current 30,281
Deferred Credit And Other Noncurrent Liabilities [Member]  
Operating Lease, Liability, Noncurrent $ 323,168
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