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Stock-Based Compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Oct. 16, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Based Compensation [Abstract]        
Increase in number of common stock shares authorized 233,334      
Percentage to retain annual restricted stock awards 50.00%      
Stock options exercise price description may not be exercised at a price which is less than 100% of the fair market value of shares at the date of grant.      
Intrinsic value of stock options exercised   $ 0 $ 664,321 $ 0
Proceeds from stock options exercised   0 354 0
Weighted average grant date fair value of restricted stock that vested during   2,385,000 2,300,000 2,116,000
Net value of unrecognized compensation cost related to unvested restricted stock awards   4,166,000 4,063,000 4,223,000
Restricted stock [Member]        
Stock Based Compensation [Abstract]        
Stock-Based Compensation expense   2,201,000 2,279,000 2,101,000
Recognized tax benefits   $ 251,000 $ 912,000 $ 840,000
Common Class A [Member] | Convert For Class B [Member]        
Stock Based Compensation [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 370,000      
Common Class A [Member] | Stock Option [Member]        
Stock Based Compensation [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 990,000      
Common Class A [Member] | Incentive Compensation Plan [Member]        
Stock Based Compensation [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 620,000      
Common Class B [Member]        
Stock Based Compensation [Abstract]        
Increase in number of common stock shares authorized 90,000      
Common Class B [Member] | Stock Option [Member]        
Stock Based Compensation [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 370,000