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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Jan. 26, 2018
Consolidated Balance Sheets      
Allowance for doubtful accounts, accounts receivable $ 10,774 $ 49,963  
Ordinary shares, shares authorized 50,000,000 50,000,000  
Ordinary shares, par value (in dollars per share) $ 0.001 $ 0.001  
Ordinary shares, shares issued 11,640,820 11,621,459 10,380,000
Ordinary shares, shares outstanding 11,640,820 11,621,459