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Trade Accounts and Notes Receivable - Trade Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Current trade accounts receivable |  |
Trade accounts receivable | $ 5,695 | $ 14,090
Allowance for doubtful accounts | (558) | (496)
Total | $ 5,137 | $ 13,594

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