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Derivatives (Summary Of Derivative Contracts) (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Gross amounts recognized - Current Assets [1] $ 2,502,245 $ 42,150
Offsetting adjustments - Current Assets [1] (32,617) (42,150)
Net presentation on Condensed Balance Sheets - Current Assets [1] 2,469,628  
Gross amounts recognized - Non-Current Assets [1] 322,537  
Net presentation on Condensed Balance Sheets - Non-Current Assets [1] 322,537  
Gross amounts recognized - Current Liabilities [1] 32,617 3,106,196
Offsetting adjustments - Current Liabilities [1] $ (32,617) (42,150)
Net presentation on Condensed Balance Sheets - Current Liabilities [1]   3,064,046
Gross amounts recognized - Non-Current Liabilities [1]   349,970
Net presentation on Condensed Balance Sheets - Non-Current Liabilities [1]   $ 349,970
[1] See Fair Value Measurements section for further disclosures regarding fair value of financial instruments.