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NET INCOME PER COMMON SHARE AND EQUITY PER COMMON SHARE (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
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) 8,681,000 8,547,000 8,653,000 7,960,000  
Dilutive effect of employee stock options (in shares) 71,000 32,000 46,000 40,000  
Weighted average common shares outstanding during the period for Diluted computation (in shares) 8,752,000 8,579,000 8,699,000 8,000,000  
Common stock excluded from calculations of diluted net income per share (in shares)     60,750    
Class of Stock [Line Items]          
Equity per common share (in dollars per share) $ 13.39   $ 13.39   $ 13.91
Class A Stock [Member]
          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) 15,000,000   15,000,000    
Common stock, shares issued (in shares) 7,813,892 7,710,195 7,813,892 7,710,195  
Common stock, shares outstanding (in shares) 7,813,892 7,710,195 7,813,892 7,710,195  
Common stock, par value (in dollars per share) $ 1.00   $ 1.00    
Common stock, shares issued during period (in shares) 35,835 28,049 84,386 66,251  
Class B Stock [Member]
          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) 1,040,000   1,040,000    
Common stock, shares issued (in shares) 881,452 881,452 881,452 881,452  
Common stock, shares outstanding (in shares) 881,452 881,452 881,452 881,452  
Common stock, par value (in dollars per share) $ 1.00   $ 1.00