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Property and Equipment (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Subtotal $ 3,787,872 $ 3,762,224
Less: accumulated depreciation (3,281,713) (3,241,294)
Property and equipment, net 506,159 520,930
Land [Member]    
Subtotal 383,420 371,195
Buildings and leasehold improvements [Member]    
Subtotal 2,229,480 2,225,386
Machinery and equipment [Member]    
Subtotal 990,889 987,234
Office equipment [Member]    
Subtotal $ 184,083 $ 178,409