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INVENTORIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
INVENTORIES [Abstract]      
Excess of current costs over carrying value of inventories $ 18,996,000 $ 18,110,000  
Positive (negative) effect of LIFO valuation method as compared to the FIFO method (886,000) (250,000) (1,504,000)
Decrease in cost of goods sold due to effect of liquidation $ 391,000 $ 211,000  
Effect of liquidation on diluted income per share (in dollars per share) $ 0.02 $ 0.01