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Leases (Schedule of Rent Expense and Sublease Income) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rent expense $ 1,136,610 $ 1,074,437 $ 1,150,614
Sublease income 662,358 $ 573,494 $ 646,235
Future minimum sublease income under noncancelable operating subleases $ 300,000