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1. BASIS OF PRESENTATION AND CONSOLIDATION (Tables) | 3 Months Ended
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Mar. 31, 2021
Accounting Policies [Abstract] |
Property plant and equipment useful life |
|  | Useful life (in years)
Buildings (including salt pans) |  |  | 8 - 20 |
Plant and machinery (including protective shells, transmission channels and ducts) |  |  | 3 - 8 |
Motor vehicles |  |  | 5 |
Furniture, fixtures and equipment |  |  | 3-8 |

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