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Accrued Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Payables and Accruals [Abstract] |  |
Ad valorem taxes | $ 1,818 | $ 2,736
Accrued interest | 1,154 | 1,135
Accrued employee wages and benefits | 330 | 964
Current portion of deferred retirement obligations | 342 | 342
Accrued dividends | 496 | 498
Inventory received but not invoiced | 0 | 710
Other accrued liabilities | 424 | 535
Total accrued liabilities | $ 4,564 | $ 6,920

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