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Consolidated Balance Sheets (Parentheticals) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 59,922 $ 58,707
Consolidated VIE, liabilities $ 19,460,257 $ 34,008,908
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 22,054,816 22,054,816