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Fair Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Assets:    
Interest rate swap $ 200,945 $ 310,563
Liabilities:    
Natural gas purchases 749,564 693,495
Interest Rate Swap [Member]    
Assets:    
Interest rate swap 200,945 310,563
Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Interest rate swap 0 0
Liabilities:    
Natural gas purchases 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member]    
Assets:    
Interest rate swap 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Interest rate swap 200,945 310,563
Liabilities:    
Natural gas purchases 749,564 693,495
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]    
Assets:    
Interest rate swap 200,945 310,563
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Interest rate swap 0 0
Liabilities:    
Natural gas purchases 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member]    
Assets:    
Interest rate swap $ 0 $ 0