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Condensed financial information of the parent company (Details) - Schedule of parent company statements of income and comprehensive income - Parent Company [Member] - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]      
Equity in gain of subsidiaries $ 4,470,613 $ 4,046,770 $ 3,019,323
General and administrative expenses (12,233) (100)
Net Income 4,458,380 4,046,670 3,019,323
Other Comprehensive (Loss) Income      
Foreign currency translation adjustment 1,259,984 (173,604) (379,520)
Comprehensive Income $ 5,718,364 $ 3,873,066 $ 2,639,803