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STOCK COMPENSATION PLANS (Details)
 12 Months Ended
Jun. 28, 2017
$ / shares
shares
May 03, 2017
$ / shares
shares
May 04, 2016
$ / shares
shares
Dec. 18, 2015
$ / shares
shares
Dec. 31, 2017
USD ($)
Director
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of directors in committee | Director         3    
Shares [Abstract]              
Granted (in shares) | shares         0 0 0
Weighted Average Exercise [Abstract]              
Total intrinsic value of options exercised | $         $ 1,198,000 $ 351,000 $ 379,000
Received cash from the exercise of options | $         957,000    
Tax benefit realized during the period | $         1,400,000    
Options Exercisable [Abstract]              
Unrecognized expense related to non-vested option shares | $         64,000    
Shares [Roll Forward]              
Granted (in shares) | shares     5,000        
Weighted Average Exercise Price [Abstract]              
Fair market value (in dollars per share)     $ 27.70        
Award vesting period     1 year        
Intrinsic value of awards | $         $ 441,000    
$15.26 - $18.61 [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)         $ 18.61    
Shares Outstanding (in shares) | shares         41,802    
Weighted Average Remaining Life         1 year 11 months 26 days    
Weighted Average Exercise Price (in dollars per shares)         $ 17.52    
Aggregate Intrinsic Value | $         $ 879,409    
Options Exercisable [Abstract]              
Range of Exercise Price, Minimum (in dollars per shares)         $ 15.26    
Range of Exercise Price, Maximum (in dollars per shares)         $ 18.61    
Shares Exercisable (in shares) | shares         41,802    
Weighted Average Remaining Life         1 year 11 months 26 days    
Weighted Average Exercise Price (in dollars per shares)         $ 17.52    
Aggregate Intrinsic Value | $         $ 879,409    
$18.62 - $22.66 [Member] | Employee and Director [Member]              
Options Outstanding [Abstract]              
Range of Exercise Price, Minimum (in dollars per shares)         $ 18.62    
Range of Exercise Price, Maximum (in dollars per shares)         $ 22.66    
Shares Outstanding (in shares) | shares         135,000    
Weighted Average Remaining Life         4 years 10 months 10 days    
Weighted Average Exercise Price (in dollars per shares)         $ 20.64    
Aggregate Intrinsic Value | $         $ 2,418,187    
Options Exercisable [Abstract]              
Range of Exercise Price, Minimum (in dollars per shares)         $ 18.62    
Range of Exercise Price, Maximum (in dollars per shares)         $ 22.66    
Shares Exercisable (in shares) | shares         135,000    
Weighted Average Remaining Life         4 years 10 months 10 days    
Weighted Average Exercise Price (in dollars per shares)         $ 20.64    
Aggregate Intrinsic Value | $         $ 2,418,187    
Non-vested Option [Member]              
Options Exercisable [Abstract]              
Unrecognized expense related to non-vested option shares | $         0    
Restricted Stock Awards [Member] | 2015 Equity Compensation Plan [Member]              
Options Exercisable [Abstract]              
Unrecognized expense related to non-vested option shares | $         $ 63,700    
Weighted Average Exercise Price [Abstract]              
Award vesting period         3 months 29 days    
Unrestricted Stock Awards [Member] | 2015 Equity Compensation Plan [Member]              
Weighted Average Exercise Price [Abstract]              
Shares issued as fully vested unrestricted stock awards (in shares) | shares       5,000      
Fair market value (in dollars per share)       $ 27.38      
Class A Stock [Member] | Stock Options [Member]              
Shares [Abstract]              
Outstanding at beginning of year (in shares) | shares         231,755 270,000 376,250
Granted (in shares) | shares         0 0 0
Exercised (in shares) | shares         (54,953) (38,245) (106,250)
Expired (in shares) | shares         0 0 0
Outstanding at end of year (in shares) | shares         176,802 231,755 270,000
Options exercisable at year end (in shares) | shares         176,802 231,755 270,000
Weighted Average Exercise [Abstract]              
Outstanding at beginning of year (in dollars per shares)         $ 19.32 $ 19.34 $ 19.52
Granted, weighted average exercise price (in dollars per share)         0 0 0
Exercised, weighted average exercise price (in dollars per shares)         17.42 19.50 19.97
Expired, weighted average exercise price (in dollars per share)         0 0 0
Outstanding at end of year (in dollars per shares)         19.91 19.32 19.34
Options exercisable at year end (in dollars per shares)         $ 19.91 $ 19.32 $ 19.34
Class A Stock [Member] | Restricted Stock Awards [Member]              
Shares [Roll Forward]              
Outstanding at beginning of year (in shares) | shares         5,000 0 0
Granted (in shares) | shares         11,568 5,000 5,000
Vested/Released (in shares) | shares         (11,568) 0 (5,000)
Cancelled (in shares) | shares         0 0 0
Unvested Outstanding at end of year (in shares) | shares         5,000 5,000 0
Weighted Average Grant Date Fair Value [Abstract]              
Outstanding at beginning of year (in dollars per shares)         $ 27.70 $ 0  
Granted (in dollars per shares)         38.08 27.70  
Vested/Released (in dollars per shares)         33.58 0  
Cancelled (in dollars per shares)         0 0  
Unvested Outstanding at end of year (in dollars per shares)         $ 38.10 27.70 $ 0
Weighted Average Exercise Price [Abstract]              
Outstanding at beginning of year (in dollars per shares)           $ 0 0
Granted (in dollars per shares)             27.38
Vested/Released (in dollars per shares)             27.38
Cancelled (in dollars per shares)             0
Unvested Outstanding at end of year (in dollars per shares)             $ 0
Class A Stock [Member] | Restricted Stock Awards [Member] | 2015 Equity Compensation Plan [Member]              
Shares [Roll Forward]              
Granted (in shares) | shares 6,568 5,000 5,000        
Weighted Average Exercise Price [Abstract]              
Fair market value (in dollars per share) $ 38.06 $ 38.10 $ 27.70        
Award vesting period   1 year 1 year        
Class A Stock [Member] | Unrestricted Stock Awards [Member] | 2015 Equity Compensation Plan [Member]              
Shares [Roll Forward]              
Granted (in shares) | shares 6,568            
Weighted Average Exercise Price [Abstract]              
Fair market value (in dollars per share) $ 38.06