Derivatives (Summary Of Derivative Contracts) (Details) - USD ($)		Mar. 31, 2018	Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross amounts recognized - Current Assets	[1]	$ 251,115	$ 735,702
Offsetting adjustments - Current Assets	[1]	(251,115)	(190,778)
Net presentation on Condensed Balance Sheets - Current Assets	[1]		544,924
Gross amounts recognized - Current Liabilities	[1]	2,132,137	190,778
Offsetting adjustments - Current Liabilities	[1]	(251,115)	(190,778)
Net presentation on Condensed Balance Sheets - Current Liabilities	[1]	1,881,022
Gross amounts recognized - Non-Current Assets	[1]	7,836	9,439
Offsetting adjustments - Non-Current Assets	[1]	(7,836)	(9,439)
Gross amounts recognized - Non-Current Liabilities	[1]	97,173	38,204
Offsetting adjustments - Non-Current Liabilities	[1]	(7,836)	(9,439)
Net presentation on Condensed Balance Sheets - Non-Current Liabilities	[1]	$ 89,337	$ 28,765

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