Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Payables and Accruals [Abstract]
Ad valorem taxes	$ 157	$ 2,736
Accrued interest	1,233	1,135
Accrued employee wages and benefits	330	964
Inventory received but not invoiced	846	710
Current portion of deferred retirement obligations	342	342
Other accrued liabilities	112	535
Total accrued liabilities	$ 3,020	$ 6,422