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Financial Instruments Securities Available for Sale (Details) (3 years or less [Member], Corporate Debt Securities [Member], USD $)
Jun. 30, 2013
Dec. 31, 2012
3 years or less [Member] | Corporate Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Maturities in Years 3 years 3 years
Amortized Cost $ 9,271,000 $ 7,662,000
Unrealized Gains 4,000 17,000
Unrealized Losses (45,000) 0
Fair Value $ 9,230,000 $ 7,679,000