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Leases (Schedule of Rent Expense and Sublease Income) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Rent expense $ 1,246,143 $ 1,136,610 $ 1,074,437
Sublease income 688,020 $ 662,358 $ 573,494
Future minimum sublease income under noncancelable operating subleases $ 700,000