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Note 10 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Balance $ 100,732,625 $ 93,090,656
Other comprehensive loss (1,013,827) (168,667)
Balance 103,544,603 94,890,007
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance 3,428,922  
Other comprehensive loss (1,025,720)  
Balance 2,403,202  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Balance (1,175,633)  
Other comprehensive loss 11,893  
Balance (1,163,740)  
AOCI Attributable to Parent [Member]    
Balance 2,253,289 1,964,364
Other comprehensive loss (1,013,827) (168,667)
Balance $ 1,239,462 $ 1,795,697