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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Cash) (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Cash and cash equivalents $ 34,736,287 $ 20,538,057 $ 22,093,710 $ 4,672,034
Restricted cash 7,913,156 2,502,591 2,717,187 923,193
Total cash, cash equivalents, and restricted cash $ 42,649,443 $ 23,040,648 $ 24,810,897 $ 5,595,227