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Financial Instruments-Available for Sale Securities (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair value of short term investment unrealized holdings and gains    
Amortized Cost $ 11,970 $ 11,984
Aggregate fair value 11,967 11,983
Unrealized Holdings gains 0 0
Unrealized Holdings Losses $ 3 $ 1