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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Balance $ 108,136,775 $ 100,732,625
Other comprehensive income (loss) (1,064,839) (926,718)
Balance 113,552,790 108,136,775
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance 1,531,649 3,428,922
Other comprehensive income (loss) (867,081) (1,897,273)
Balance 664,568 1,531,649
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Balance (205,078) (1,175,633)
Other comprehensive income (loss) (197,758) 970,555
Balance (402,836) (205,078)
AOCI Attributable to Parent [Member]    
Balance 1,326,571 2,253,289
Other comprehensive income (loss) (1,064,839) (926,718)
Balance $ 261,732 $ 1,326,571