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Other Current Liabilities
 12 Months Ended
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]  
Other Current Liabilities
(8) Other Current Liabilities

Other current liabilities are comprised of the following:

 

     December 31,  
     2016      2017  

Accrued payroll expenses

    $ 10,667,203      $ 7,032,508  

Deferred revenue

      1,798,443        1,893,508  

Dividends payable

      1,280,410        1,286,381  

Trade sales payable

      1,082,702        1,276,170  

Deferred rent

      1,164,609        1,349,515  

Other accrued expenses

      5,180,052        5,961,113  
  

 

 

     

 

 

  
   $ 21,173,419      $ 18,799,195