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Investment securities (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aug. 10, 2010
Security Owned Not Readily Marketable [Line Items]        
Impairment loss on investment $ 0 $ 1,299 $ 0  
Purchase Of Corporate Covertible Bonds       1,620,000
Proceeds From Sale Of Bond   5,431    
Marketable Securities, Gain (Loss)   645    
Debt Instrument, Convertible, Conversion Ratio   0.6020    
Eturbotouch Technology Inc [Member]
       
Security Owned Not Readily Marketable [Line Items]        
Impairment loss on investment   $ 238