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Other Current Liabilities
 12 Months Ended
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]  
Other Current Liabilities
 
(8)    
Other Current Liabilities
 
Other current liabilities are comprised of the following:

 
 
 
December 31,
 
 
 
2017
 
 
2018
 
Accrued payroll expenses
 
$
7,032,508
 
 
$
7,120,055
 
Deferred revenue
 
 
1,893,508
 
 
 
1,868,223
 
Dividends payable
 
 
1,286,381
 
 
 
1,367,761
 
Trade sales payable
 
 
1,276,170
 
 
 
1,250,454
 
Deferred rent
 
 
1,349,515
 
 
 
1,561,486
 
Other accrued expenses
 
 
5,961,113
 
 
 
6,013,129
 
 
 
$
18,799,195
 
 
$
19,181,108