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Derivatives (Summary Of Derivative Contracts) (Details) - USD ($)
Mar. 31, 2019
Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Gross amounts recognized - Current Assets [1] $ 1,084,937 $ 42,150
Offsetting adjustments - Current Assets [1] (369,714) (42,150)
Net presentation on Condensed Balance Sheets - Current Assets [1] 715,223  
Gross amounts recognized - Non-Current Assets [1] 149,990  
Offsetting adjustments - Non-Current Assets [1] (48,007)  
Net presentation on Condensed Balance Sheets - Non-Current Assets [1] 101,983  
Gross amounts recognized - Current Liabilities [1] 369,714 3,106,196
Offsetting adjustments - Current Liabilities [1] (369,714) (42,150)
Net presentation on Condensed Balance Sheets - Current Liabilities [1]   3,064,046
Gross amounts recognized - Non-Current Liabilities [1] 48,007 349,970
Offsetting adjustments - Non-Current Liabilities [1] $ (48,007)  
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.