Derivatives (Summary Of Derivative Contracts) (Details) - USD ($)		Dec. 31, 2017	Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross amounts recognized - Current Assets	[1]	$ 1,259,358	$ 735,702
Offsetting adjustments - Current Assets	[1]	(1,259,358)	(190,778)
Net presentation on Condensed Balance Sheets - Current Assets	[1]		544,924
Gross amounts recognized - Current Liabilities	[1]	1,594,235	190,778
Offsetting adjustments - Current Liabilities	[1]	(1,259,358)	(190,778)
Net presentation on Condensed Balance Sheets - Current Liabilities	[1]	$ 334,877
Gross amounts recognized - Non-Current Assets	[1]		9,439
Offsetting adjustments - Non-Current Assets	[1]		(9,439)
Gross amounts recognized - Non-Current Liabilities	[1]		38,204
Offsetting adjustments - Non-Current Liabilities	[1]		(9,439)
Net presentation on Condensed Balance Sheets - Non-Current Liabilities	[1]		$ 28,765

[1] See Fair Value Measurements section for further disclosures regarding fair value of financial instruments.