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Note 13 - Leases (Details Textual)
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Assets [Abstract]      
Other Assets, Miscellaneous, Noncurrent   $ 703,394 $ 624,095
Liabilities, Current [Abstract]      
Other Liabilities, Current   25,729 30,281
Liabilities, Noncurrent [Abstract]      
Liabilities, Other than Long-Term Debt, Noncurrent   47,191,110 $ 44,233,200
Number of Additional Operating Leases 3    
Operating Lease, Right-of-Use Asset   331,275  
Operating Lease, Liability, Current   25,729  
Operating Lease, Liability, Noncurrent   $ 308,439  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]   Other Assets, Miscellaneous, Noncurrent  
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