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Derivative Assets and Derivative Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Assets and Derivative Liabilities [abstract] |
Schedule of Derivative Assets and Liabilities |
|  | December 31, |  | December 31,
Assets |  | 2018 |  | 2017
Interest rate swap |  | $ | - |  | $ | 140
Commodity derivative contracts |  |  | 2,646 |  |  | -
Derivative assets |  | $ | 2,646 |  | $ | 140
Liabilities |  |  |  |  |  |
Interest rate swap |  | $ | 224 |  | $ | -
Commodity derivative contracts |  |  | - |  |  | 2,328
Derivative liabilities |  | $ | 224 |  | $ | 2,328
Schedule of Derivative Gain (Loss) Settled and Open Positions | The following table summarizes the gains (losses) from the settlement of and the open positions for the zinc and lead forward sales contracts:
|  | Years ended December 31,
|  | 2018 |  | 2017
Realized |  |  |  |  |  |
Zinc Contracts |  |  |  |  |  |
Tonnes settled |  |  | 8,000 |  |  | 7,803
Average settlement price per tonne |  | $ | 2,925 |  | $ | 2,894
Settlement losses |  | $ | (49) |  | $ | (1,521)
Lead Contracts |  |  |  |  |  |
Tonnes settled |  |  | 6,000 |  |  | 4,465
Average settlement price per tonne |  | $ | 2,302 |  | $ | 2,361
Settlement gains (losses) |  | $ | 443 |  | $ | 19
Unrealized |  |  |  |  |  |
Zinc Contracts |  |  |  |  |  |
Open positions - tonnes |  |  | 4,500 |  |  | 6,500
Price per tonne |  | $ | 3,050 - 3,300 |  | $ | 2,500 - 3,190
Unrealized gains (losses) |  | $ | 4,630 |  | $ | (2,957)
Lead Contracts |  |  |  |  |  |
Open positions - tonnes |  |  | - |  |  | 6,000
Price per tonne |  | $ | - |  | $ | 2,100 - 2,689
Unrealized gains (losses) |  | $ | 344 |  | $ | (344)

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