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NET INCOME PER COMMON SHARE AND EQUITY PER COMMON SHARE (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 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) 8,651,000 7,672,000 8,638,000 7,662,000  
Dilutive effect of employee stock options (in shares) 35,000 42,000 36,000 44,000  
Weighted average common shares outstanding during the period for Diluted computation (in shares) 8,686,000 7,714,000 8,674,000 7,706,000  
Common stock excluded from calculations of diluted net income per share (in shares) 200,250   234,000    
Class of Stock [Line Items]          
Equity per common share (in dollars per share) $ 13.40   $ 13.40   $ 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) 7,778,057 6,793,856 7,778,057 6,793,856  
Common stock, shares outstanding (in shares) 7,778,057 6,793,856 7,778,057 6,793,856  
Common stock, par value (in dollars per share) $ 1.00   $ 1.00    
Common stock, shares issued during period (in shares) 17,814 10,045 48,551 38,202  
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