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STOCK COMPENSATION PLANS (Details)
 12 Months Ended
May 02, 2018
$ / shares
shares
Jun. 28, 2017
$ / shares
shares
May 03, 2017
$ / shares
shares
May 04, 2016
$ / shares
shares
Dec. 31, 2018
USD ($)
Director
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Stock Compensation Plans [Abstract]              
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 | $         $ 176,000 $ 1,198,000 $ 351,000
Received cash from the exercise of options | $         127,000    
Tax benefit realized during the period | $         367,000    
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 | $         $ 191,000    
$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         67,500    
Weighted Average Remaining Life         2 years 3 months 7 days    
Weighted Average Exercise Price (in dollars per shares)         $ 18.48    
Aggregate Intrinsic Value | $         $ 1,106,663    
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         67,500    
Weighted Average Remaining Life         2 years 3 months 7 days    
Weighted Average Exercise Price (in dollars per shares)         $ 18.48    
Aggregate Intrinsic Value | $         $ 1,106,663    
$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         101,250    
Weighted Average Remaining Life         4 years 11 days    
Weighted Average Exercise Price (in dollars per shares)         $ 21.19    
Aggregate Intrinsic Value | $         $ 1,384,763    
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         101,250    
Weighted Average Remaining Life         4 years 11 days    
Weighted Average Exercise Price (in dollars per shares)         $ 21.19    
Aggregate Intrinsic Value | $         $ 1,384,763    
Non-vested Option [Member]              
Weighted Average Exercise [Abstract]              
Unrecognized expense related to non-vested option shares | $         0    
Restricted Stock Awards [Member] | 2015 Equity Compensation Plan [Member]              
Weighted Average Exercise [Abstract]              
Unrecognized expense related to non-vested option shares | $         $ 63,800    
Weighted Average Exercise Price [Abstract]              
Award vesting period         3 months 29 days    
Class A Stock [Member] | Stock Options [Member]              
Shares [Abstract]              
Outstanding at beginning of year (in shares) | shares         176,802 231,755 270,000
Granted (in shares) | shares         0 0 0
Exercised/vested and released, option shares (in shares) | shares         (8,052) (54,953) (38,245)
Expired (in shares) | shares         0 0 0
Outstanding at end of year (in shares) | shares         168,750 176,802 231,755
Options exercisable at year end (in shares) | shares         168,750 176,802 231,755
Weighted Average Exercise [Abstract]              
Outstanding at beginning of year (in dollars per shares)         $ 19.91 $ 19.32 $ 19.34
Granted, weighted average exercise price (in dollars per share)         0 0 0
Exercised/vested and released, weighted average exercise price (in dollars per shares)         15.77 17.42 19.50
Expired/cancelled, weighted average exercise price (in dollars per share)         0 0 0
Outstanding at end of year (in dollars per shares)         20.11 19.91 19.32
Options exercisable at year end (in dollars per shares)         $ 20.11 $ 19.91 $ 19.32
Class A Stock [Member] | Restricted Stock Awards [Member]              
Shares [Roll Forward]              
Outstanding at beginning of year (in shares) | shares         5,000 5,000 0
Granted (in shares) | shares 5,000 6,568 5,000 5,000 5,000 11,568 5,000
Vested/Released (in shares) | shares         (5,000) (11,568) 0
Cancelled (in shares) | shares         0 0 0
Unvested Outstanding at end of year (in shares) | shares         5,000 5,000 5,000
Weighted Average Grant Date Fair Value [Abstract]              
Outstanding at beginning of year (in dollars per shares)         $ 38.10 $ 27.70  
Granted (in dollars per shares)         38.51 38.08  
Vested/Released (in dollars per shares)         38.10 33.58  
Cancelled (in dollars per shares)         0 0  
Unvested Outstanding at end of year (in dollars per shares)         $ 38.51 38.10 $ 27.70
Weighted Average Exercise Price [Abstract]              
Outstanding at beginning of year (in dollars per shares)           $ 27.70 0
Granted (in dollars per shares)             27.70
Vested/Released (in dollars per shares)             0
Cancelled (in dollars per shares)             0
Unvested Outstanding at end of year (in dollars per shares)             $ 27.70
Fair market value (in dollars per share) $ 38.51 $ 38.06 $ 38.10 $ 27.70      
Award vesting period     1 year 1 year