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NET INCOME PER COMMON SHARE AND EQUITY PER COMMON SHARE (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Shares used in computing basic and diluted net income per share [Abstract]      
Weighted average common shares outstanding during the period for Basic computation (in shares) 8,725,000 8,626,000  
Dilutive effect of employee stock options (in shares) 69,000 37,000  
Weighted average common shares outstanding during the period for Diluted computation (in shares) 8,794,000 8,663,000  
Common stock excluded from calculations of diluted net income per share (in shares) 0    
Class of Stock [Line Items]      
Equity per common share (in dollars per share) $ 13.60   $ 13.64
Class A Stock [Member]
      
Class of Stock [Line Items]      
Common stock, shares authorized (in shares) 15,000,000    
Common stock, shares issued (in shares) 7,859,027 7,760,243  
Common stock, shares outstanding (in shares) 7,859,027 7,760,243  
Common stock, par value (in dollars per share) $ 1.00    
Common stock, shares issued during period (in shares) 30,191 30,737  
Class B Stock [Member]
      
Class of Stock [Line Items]      
Common stock, shares authorized (in shares) 1,040,000    
Common stock, shares issued (in shares) 881,452 881,452  
Common stock, shares outstanding (in shares) 881,452 881,452  
Common stock, par value (in dollars per share) $ 1.00