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STOCK COMPENSATION PLANS (Details)
12 Months Ended
May 04, 2016
$ / shares
shares
Dec. 18, 2015
$ / shares
shares
Dec. 31, 2016
USD ($)
Director
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 09, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorizes under the plan (in shares) | shares           331,500
Shares granted as restricted stock awards | shares 5,000          
Shares issued as fully vested unrestricted stock awards | shares   5,000        
Fair market value (in dollars per share) $ 27.70 $ 27.38        
Award vesting period 1 year          
Number of directors in committee | Director     3      
Weighted Average Exercise [Abstract]            
Granted, weighted average grant-date fair value per option (in dollars per share)         $ 3.95  
Exercised/ vested and released, aggregate intrinsic value | $     $ 351,000 $ 379,000 $ 247,000  
Received cash from the exercise of options | $     746,000      
Tax benefit realized during the period | $     $ 351,000      
$15.26 - $19.04 [Member] | Employee and director [Member]            
Options Outstanding [Abstract]            
Range of Exercise Price, Minimum (in dollars per shares)     $ 15.26      
Range of Exercise Price, Maximum (in dollars per shares)     $ 19.04      
Shares Outstanding (in shares) | shares     123,755      
Weighted Average Remaining Life     3 years 3 months 11 days      
Weighted Average Exercise Price (in dollars per shares)     $ 17.77      
Aggregate Intrinsic Value | $     $ 1,753,268      
Options Exercisable [Abstract]            
Range of Exercise Price, Minimum (in dollars per shares)     $ 15.26      
Range of Exercise Price, Maximum (in dollars per shares)     $ 19.04      
Shares Exercisable (in shares) | shares     123,755      
Weighted Average Remaining Life     3 years 3 months 11 days      
Weighted Average Exercise Price (in dollars per shares)     $ 17.77      
Aggregate Intrinsic Value | $     $ 1,753,268      
$19.05 - $22.66 [Member] | Employee and director [Member]            
Options Outstanding [Abstract]            
Range of Exercise Price, Minimum (in dollars per shares)     $ 19.05      
Range of Exercise Price, Maximum (in dollars per shares)     $ 22.66      
Shares Outstanding (in shares) | shares     108,000      
Weighted Average Remaining Life     5 years 8 months 1 day      
Weighted Average Exercise Price (in dollars per shares)     $ 21.09      
Aggregate Intrinsic Value | $     $ 1,171,678      
Options Exercisable [Abstract]            
Range of Exercise Price, Minimum (in dollars per shares)     $ 19.05      
Range of Exercise Price, Maximum (in dollars per shares)     $ 22.66      
Shares Exercisable (in shares) | shares     108,000      
Weighted Average Remaining Life     5 years 8 months 1 day      
Weighted Average Exercise Price (in dollars per shares)     $ 21.09      
Aggregate Intrinsic Value | $     $ 1,171,678      
Class A Stock [Member] | Stock Options [Member]            
Shares [Abstract]            
Outstanding at beginning of year (in shares) | shares     270,000 376,250 387,000  
Granted (in shares) | shares     0 0 33,750  
Exercised/vested and released, option shares (in shares) | shares     (38,245) (106,250) (44,500)  
Expired (in shares) | shares     0 0 0  
Outstanding at end of year (in shares) | shares     231,755 270,000 376,250  
Exercisable/vested at end of period, option share (in shares) | shares     231,755 270,000 342,500  
Weighted Average Exercise [Abstract]            
Outstanding at beginning of year (in dollars per shares)     $ 19.34 $ 19.52 $ 18.96  
Granted, weighted average exercise price (in dollars per share)     0 0 21.86  
Exercised/vested and released, weighted average exercise price (in dollars per shares)     19.50 19.97 16.45  
Expired/cancelled, weighted average exercise price (in dollars per share)     0 0 0  
Outstanding at end of year (in dollars per shares)     19.32 19.34 19.52  
Exercisable/vested at end of period, weighted average exercise price (in dollars per shares)     $ 19.32 $ 19.34 $ 19.29