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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Balance $ 93,090,656 $ 99,701,709
Other comprehensive income (loss) 288,925 3,499,798
Balance 100,732,625 93,090,656
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance 3,563,341 (888,210)
Other comprehensive income (loss) (134,419) 4,451,551
Balance 3,428,922 3,563,341
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Balance (1,598,977) (647,224)
Other comprehensive income (loss) 423,344 (951,753)
Balance (1,175,633) (1,598,977)
AOCI Attributable to Parent [Member]    
Balance 1,964,364 (1,535,434)
Other comprehensive income (loss) 288,925 3,499,798
Balance $ 2,253,289 $ 1,964,364