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Accrued Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Payables and Accruals [Abstract] |  |
Ad valorem taxes | $ 748 | $ 2,648
Accrued interest | 1,140 | 1,165
Accrued employee wages and benefits | 1,732 | 1,320
Accrued dividends | 494 | 494
Current portion of deferred retirement obligations | 315 | 315
Accrued insurance | 0 | 166
Other accrued liabilities | 562 | 673
Total accrued liabilities | $ 4,991 | $ 6,781

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