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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts $ 36,645 $ 59,922
Consolidated VIE, liabilities $ 16,342,512 $ 19,460,257
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