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Cash and Restricted Cash - Cash and Restricted Cash (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Notes to Financial Statements        
Cash $ 496,110 $ 774,226    
Cash equivalents 7,339,090 8,592,718    
Restricted cash 0 0    
Cash, cash equivalents, and restricted cash $ 7,835,200 $ 9,366,944 $ 15,480,020 $ 22,602,982