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Commitments and Contingencies (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 01, 2017 | Apr. 19, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |
Industrial revenue bonds |  |  |  |  | $ 10,000,000
Capital lease obligations |  |  | $ 0 | $ 0 |
OSHA, loss in period |  | $ 138,000 |  |  |
Payments for legal settlements |  | $ 75,000 |  |  |
Civil penalties sought | $ 250,000 |  |  |  |
Damages awarded |  |  | 251,000 |  |
Clean Air Act Violation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Fine payable due to plea agreement |  |  | $ 1,000,000 |  |
EPA Administrative Civil Penalty |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimate of possible loss | $ 250,000 |  |  |  |

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