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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Schedule of useful lives of property, plant and equipment | Depreciation is calculated using the straight-line method over the estimated useful lives of the property, plant and equipment, which are:
| Years
Land improvements | 10
Plant and buildings | 5-15
Real estate properties | 10-40
Railroad and sidings | 30
Vehicles | 3-5
Machinery, equipment and tooling | 3-15
Furniture and fixtures | 3-10
Deferred mining costs | 3
Net property, plant and equipment consisted of:
| March 31, 2018 |  | December 31, 2017
Machinery, equipment and tooling | $ | 10,529 |  |  | $ | 8,242 |
Vehicles | 1,544 |  |  | 1,546 |
Furniture and fixtures | 730 |  |  | 720 |
Plant and building | 83,057 |  |  | 81,561 |
Real estate properties | 4,432 |  |  | 4,432 |
Railroad and sidings | 25,286 |  |  | 10,254 |
Land improvements | 23,156 |  |  | 16,378 |
Asset retirement obligation | 8,657 |  |  | 8,408 |
Mineral properties | 9,879 |  |  | 9,878 |
Deferred mining costs | 657 |  |  | 657 |
Construction in progress | 71,639 |  |  | 56,493 |
| 239,566 |  |  | 198,569 |
Less: accumulated depreciation and depletion | 29,529 |  |  | 26,367 |
Total property, plant and equipment, net | $ | 210,037 |  |  | $ | 172,202 |
Reconciliation of weighted-average common shares outstanding used in the calculation of basic and diluted net income (loss) per share | The following table reconciles the weighted-average common shares outstanding used in the calculation of basic net income per share to the weighted average common shares outstanding used in the calculation of diluted net income per share:
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017
Determination of Shares |  |  |  |
Weighted average common shares outstanding | 40,412 |  |  | 39,697 |
Assumed conversion of restricted stock | 29 |  |  | 177 |
Diluted weighted average common stock outstanding | 40,441 |  |  | 39,874 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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