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Cash and Cash Equivalents (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents (Textual)        
Debt covenant, description Bank debt covenant to maintain at least $2,000,000 of otherwise unrestricted cash and cash equivalents.      
Cash and cash equivalents $ 10,584,067 $ 2,521,050 $ 3,060,470 $ 3,798,811