Condensed Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities
Net Income (Loss) Available to Common Stockholders, Basic	$ (3,027)	$ 159
Adjustments to reconcile net (loss) to net cash provided by operating activities:
Depreciation	5,134	6,218
Amortization	36	36
Increase (Decrease) in Other Operating Assets and Liabilities, Net	291	36
(Increase) decrease in current assets:
Accounts receivable	2,896	350
Inventories	(3,752)	38
Prepaid expenses and other	(422)	(421)
Increase (Decrease) in Derivative Assets	276	(646)
Increase (decrease) in current liabilities:
Accounts payable	(1,410)	(1,737)
Derivative Liability	(1,044)	(911)
Accrued expenses	(565)	(1,780)
Increase (Decrease) in Other Noncurrent Liabilities	149	149
Net Cash Provided by (Used in) Operating Activities	(1,438)	1,491
Cash Flows From Investing Activities
Purchase of property and equipment	(963)	(2,647)
Net Cash Provided by (Used in) Investing Activities	(963)	(2,647)
Cash Flows From Financing Activities
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid	0	(6,663)
Proceeds from notes payable	76,851	49,050
Payments on borrowings	(74,789)	(41,443)
Net cash (used in) financing activities	2,062	944
Cash and Cash Equivalents, Period Increase (Decrease)	(339)	(212)
Cash And Equivalents-Beginning	1,440	1,487
Cash And Equivalents-Ending	1,101	1,275
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 397	$ 428