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Accrued liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Payables and Accruals [Abstract] |  |
Ad valorem taxes | $ 0 | $ 2,196
Accrued interest | 1,320 | 1,191
Accrued employee wages and benefits | 1,003 | 3,115
Inventory received but not invoiced | 54 | 726
Accrued legal charges | 539 | 0
Accrued dividends | 447 | 492
Accrued insurance | 339 | 223
Current portion of deferred retirement obligations | 314 | 345
Accrued tender offer consulting charges | 32 | 274
Other accrued liabilities | 334 | 664
Total accrued liabilities | $ 4,382 | $ 9,226

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