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Allowance for Uncollectible Agency Fees - Roll-Forward of Allowance (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Bad debt expense $ 305,965 $ 323,208 $ 585,654 $ 575,090
Agency Fees        
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Beginning balance     182,509 166,681
Bad debt expense     423,155 291,233
Write offs     (382,192) (275,850)
Ending balance $ 223,472 $ 182,064 $ 223,472 $ 182,064