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Note 8 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) - USD ($)
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance $ 99,701,709 $ 88,887,977
Other comprehensive income 351,083 183,589
Balance 102,294,845 92,549,541
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance (888,210)  
Other comprehensive income 362,274 168,725
Balance (525,936)  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Balance (647,224)  
Other comprehensive income (11,191) 14,864
Balance (658,415)  
AOCI Attributable to Parent [Member]    
Balance (1,535,434) (3,447,944)
Other comprehensive income 351,083 183,589
Balance $ (1,184,351) $ (3,264,355)