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MARKETABLE SECURITIES - Gross unrealized gains (losses) on marketable securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized gains $ 408 $ 354
Gross unrealized (Losses) (11) (29)
Municipal Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized gains 349 308
Gross unrealized (Losses) (11) (29)
Corporate Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized gains 59 46
Gross unrealized (Losses)