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Note 11 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Balance $ 108,136,775 $ 100,732,625
Other comprehensive income (loss) 222,428 (1,013,827)
Balance 111,761,089 103,544,603
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance 1,531,649  
Other comprehensive income (loss) 230,135  
Balance 1,761,784  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Balance (205,078)  
Other comprehensive income (loss) (7,707)  
Balance (212,785)  
AOCI Attributable to Parent [Member]    
Balance 1,326,571 2,253,289
Other comprehensive income (loss) 222,428 (1,013,827)
Balance $ 1,548,999 $ 1,239,462