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Other Comprehensive Income (Reconciliation of Accumulated Comprehensive Income (Loss)) (Details) - USD ($)
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Other Accumulated Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ 88,887,977 $ 83,096,392
Other comprehensive income 183,589 279,844
Balance at end of period 92,549,541 86,359,135
Interest Rate Swaps [Member]    
Increase (Decrease) in Other Accumulated Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,651,213)  
Other comprehensive income 168,725 263,053
Balance at end of period (1,482,488)  
Defined Benefit Plans [Member]    
Increase (Decrease) in Other Accumulated Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,796,731)  
Other comprehensive income 14,864 16,791
Balance at end of period (1,781,867)  
Accumulated Other Comprehensive Income (Loss) [Member]    
Increase (Decrease) in Other Accumulated Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (3,447,944) (2,488,917)
Other comprehensive income 183,589 279,844
Balance at end of period $ (3,264,355) $ (2,209,073)