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Note 11 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Balance $ 103,544,603 $ 100,732,625 $ 94,890,007 $ 93,090,656 $ 100,732,625 $ 93,090,656
Other comprehensive income (loss) 211,425 (1,013,827) (490,526) (168,667) (802,402) (659,193)
Balance 110,543,862 103,544,603 100,278,408 94,890,007 110,543,862 100,278,408
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]            
Balance   3,428,922     3,428,922  
Other comprehensive income (loss)         (826,188)  
Balance 2,602,734       2,602,734  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]            
Balance   (1,175,633)     (1,175,633)  
Other comprehensive income (loss)         23,786  
Balance (1,151,847)       (1,151,847)  
AOCI Attributable to Parent [Member]            
Balance 1,239,462 2,253,289 1,795,697 1,964,364 2,253,289 1,964,364
Other comprehensive income (loss) 211,425 (1,013,827) (490,526) (168,667) (802,402)  
Balance $ 1,450,887 $ 1,239,462 $ 1,305,171 $ 1,795,697 $ 1,450,887 $ 1,305,171