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Note 12 - Employee Benefit Plans (Details Textual)
 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year   $ 31,000  
Defined Benefit Plan, Expected Amortization Of Net Gains (Losses), Regulatory Deferral Assets   31,000  
Defined Benefit Plan, Expected Amortization of Net Gains (Losses), Regulatory Deferral Liabilities   $ 158,000  
Pension Plan [Member]      
Defined Benefit Plan, Period Before Benefits are Fully Vested (Year)   5 years  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets   4.95% 4.50%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year   $ 0 $ 0
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Minimum Service Requirement (Year)   10 years  
Defined Benefit Plan, Age Requirement   55  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets   4.95% 4.21%
Other Postretirement Benefits Plan [Member] | Forecast [Member]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets 5.75%    
The 401K Plan [Member]      
Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent   1.00%  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   50.00%  
Defined Contribution Plan, Employer Matching Contribution, Match Percentage   100.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of 100 Percent Match   4.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Second Tranche   50.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of 50% Match   2.00%