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3. Property, Plant and Equipment (Details 1)
6 Months Ended
Jun. 30, 2019
Plant and Buildings | Minimum  
Depreciation (years) 20 years
Plant and Buildings | Maximum [Member]  
Depreciation (years) 30 years
Machinery and Equipment | Minimum  
Depreciation (years) 5 years
Machinery and Equipment | Maximum [Member]  
Depreciation (years) 7 years
Furniture and Fixtures | Minimum  
Depreciation (years) 3 years
Furniture and Fixtures | Maximum [Member]  
Depreciation (years) 5 years