1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Mar. 31, 2021
Building (Including Salt Pans) | Minimum
Property, plant and equipment, useful life	8 years
Building (Including Salt Pans) | Maximum
Property, plant and equipment, useful life	20 years
Plant and Machinery (Including Protective Shells, Transmission Channels and Ducts) | Minimum
Property, plant and equipment, useful life	3 years
Plant and Machinery (Including Protective Shells, Transmission Channels and Ducts) | Maximum
Property, plant and equipment, useful life	8 years
Motor Vehicles
Property, plant and equipment, useful life	5 years
Furniture, Fixtures and Equipment | Minimum
Property, plant and equipment, useful life	3 years
Furniture, Fixtures and Equipment | Maximum
Property, plant and equipment, useful life	8 years