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Derivatives (Summary Of Derivative Contracts) (Details) - USD ($)
Jun. 30, 2018
Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Gross amounts recognized - Current Assets [1] $ 84,260 $ 735,702
Offsetting adjustments - Current Assets [1] (84,260) (190,778)
Net presentation on Condensed Balance Sheets - Current Assets [1]   544,924
Gross amounts recognized - Current Liabilities [1] 3,098,771 190,778
Offsetting adjustments - Current Liabilities [1] (84,260) (190,778)
Net presentation on Condensed Balance Sheets - Current Liabilities [1] 3,014,511  
Gross amounts recognized - Non-Current Assets [1] 7,943 9,439
Offsetting adjustments - Non-Current Assets [1] (7,943) (9,439)
Gross amounts recognized - Non-Current Liabilities [1] 296,912 38,204
Offsetting adjustments - Non-Current Liabilities [1] (7,943) (9,439)
Net presentation on Condensed Balance Sheets - Non-Current Liabilities [1] $ 288,969 $ 28,765
[1] See Fair Value Measurements section for further disclosures regarding fair value of financial instruments.