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Cash and Restricted Cash - Cash and Restricted Cash (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Notes to Financial Statements        
Cash $ 927,296 $ 774,226    
Cash equivalents 3,485,373 8,592,718    
Restricted cash 0 0    
Cash, cash equivalents, and restricted cash $ 4,412,669 $ 9,366,944 $ 9,938,227 $ 22,602,982