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MARKETABLE SECURITIES (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
MARKETABLE SECURITIES [Abstract]    
Cost $ 633,000 $ 795,000
Accumulated net unrealized loss 84,000 212,000
Fair value 549,000 583,000
Number of securities 1,400  
Gain on sale of securities 24,000  
Impairment loss 64,000  
Net unrealized loss on marketable securities included in comprehensive income $ 128,000 $ (212,000)