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Reconciliation of Segment Operating Income (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation Of Segment Operating Income    
Total operating income $ 7,456,906 $ 7,883,053
Interest expense, net 1,858,224 1,327,160
Other expense 67,458 62,596
Consolidated income before taxes $ 5,531,224 $ 6,493,297