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Summary of Significant Accounting Policies (Property, Plant and Equipment Estimated Useful Lives) (Details)
12 Months Ended
Dec. 31, 2020
Building [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 20 years
Building [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 25 years
Equipment | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 5 years
Equipment | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 20 years
Office furniture and equipment  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 3 years
Vehicles  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 3 years