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Property and Equipment (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Subtotal $ 3,755,229 $ 3,762,224
Less: accumulated depreciation (3,249,821) (3,241,294)
Property and equipment, net 505,408 520,930
Land [Member]    
Subtotal 367,861 371,195
Buildings and leasehold improvements [Member]    
Subtotal 2,224,270 2,225,386
Machinery and equipment [Member]    
Subtotal 986,237 987,234
Office equipment [Member]    
Subtotal $ 176,861 $ 178,409