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Property, Plant and Equipment (Details Narrative) (10-K) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]        
Depreciation and amortization expense $ 193,094 $ 161,892 $ 696,144 $ 229,036