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Other Comprehensive Income (Schedule of Other Comprehensive Income and Loss) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Before-Tax Amount        
Other comprehensive income $ 80,838 $ 69,712 $ 137,606 $ 287,104
Tax (Expense) or Benefit        
Other comprehensive income (23,314) (26,462) (39,686) (108,984)
Net-of-Tax Amount        
Other comprehensive income 57,524 43,250 97,920 178,120
Interest rate swap [Member]        
Before-Tax Amount        
Other comprehensive income before reclassifications 90,363 5,654 151,944 158,988
Reclassifications from accumulated other comprehensive income (3,554)   (2,396)  
Other comprehensive income 86,809   149,548  
Tax (Expense) or Benefit        
Other comprehensive income before reclassifications (26,061) (2,146) (43,821) (60,352)
Reclassifications from accumulated other comprehensive income 1,025   691  
Other comprehensive income (25,036)   (43,130)  
Net-of-Tax Amount        
Other comprehensive income before reclassifications 64,302 3,508 108,123 98,636
Reclassifications from accumulated other comprehensive income (2,529)   (1,705)  
Other comprehensive income 61,773   106,418  
Defined benefit plans [Member]        
Before-Tax Amount        
Other comprehensive income (5,971) 64,058 (11,942) 128,116
Tax (Expense) or Benefit        
Other comprehensive income 1,722 (24,316) 3,444 (48,632)
Net-of-Tax Amount        
Other comprehensive income $ (4,249) $ 39,742 $ (8,498) $ 79,484