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Note 13 - Leases (Details Textual)
 12 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2023
Number of Additional Operating Leases 2  
Operating Lease, Right-of-Use Asset $ 341,612  
Operating Lease, Liability, Current 25,600  
Operating Lease, Liability, Noncurrent $ 319,573  
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