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MARKETABLE EQUITY SECURITIES (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
MARKETABLE EQUITY SECURITIES [Abstract]      
Impairment charges on investments in marketable securities $ 71,000 $ 315,000 $ 60,000
Available-for-sale securities [Abstract]      
Fair market value 17,188,000 20,123,000  
Cost 10,361,000 12,539,000  
Unrealized gain 6,827,000 7,584,000  
Trading securities [Abstract]      
Fair market value 132,000 141,000  
Cost 158,000 157,000  
Unrealized loss (26,000) (16,000)  
Total [Abstract]      
Fair market value 17,320,000 20,264,000  
Cost 10,519,000 12,696,000  
Unrealized gain 6,801,000 7,568,000  
Available-for-sale securities [Abstract]      
Gross unrealized gains 6,960,000 7,866,000  
Gross unrealized losses 133,000 282,000  
Unrealized gain 6,827,000 7,584,000  
Accumulated other comprehensive income 4,235,000 4,705,000  
Net unrealized gains in market value on securities classified as available-for-sale 459,000 825,000  
Trading securities recognized loss 26,000 16,000  
Trading securities, recognized gain 0 0  
Trading securities [Abstract]      
Recognized gain (loss) at beginning of period (16,000) 14,000 63,000
Recognized (loss) gain at end of period (26,000) (16,000) 14,000
Securities transferred from trading to available-for-sale 0 0 63,000
Change in net recognized (loss) gain (10,000) (30,000) 14,000
Change in net recognized (loss) gain, net of taxes (6,000) (15,000) 6,000
Realized gains [Abstract]      
Sale proceeds 4,554,000 1,137,000 622,000
Cost of securities sold 2,183,000 289,000 308,000
Realized gains 2,371,000 848,000 314,000
Realized gains, net of taxes 1,437,000 526,000 190,000
Summary of gross unrealized losses and fair value of securities [Abstract]      
Equity securities - Available-for-sale, Fair Value 17,188,000 20,123,000  
Equity securities - Trading, Fair Value 132,000 141,000  
Fair market value 17,320,000 20,264,000  
Equity securities - Available-for-sale, Unrealized Losses 133,000 282,000  
Totals, Unrealized Losses 6,801,000 7,568,000  
Margin account borrowings 10,711,000 0  
Equity Securities [Member]
     
Available-for-sale securities [Abstract]      
Fair market value 1,567,000 2,914,000  
Trading securities [Abstract]      
Fair market value 129,000 141,000  
Total [Abstract]      
Fair market value 1,696,000 3,055,000  
Unrealized gain 159,000 298,000  
Available-for-sale securities [Abstract]      
Gross unrealized losses 133,000 282,000  
Summary of gross unrealized losses and fair value of securities [Abstract]      
Equity securities - Available-for-sale, Fair Value 1,567,000 2,914,000  
Equity securities - Trading, Fair Value 129,000 141,000  
Fair market value 1,696,000 3,055,000  
Equity securities - Available-for-sale, Unrealized Losses 133,000 282,000  
Equity securities - Trading, Unrealized Losses 26,000 16,000  
Totals, Unrealized Losses $ 159,000 $ 298,000