Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Financial Instruments and Risk Management (Details Textual)

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Financial Instruments and Risk Management (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Foreign Currency Transaction Gain, before Tax $ 380,000 $ 70,000 $ 340,000
Description of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Activities Foreign exchange forward contracts in effect as of December 31, 2012 were for the conversion of 20.9 million Euros into 26.8 million U.S. dollars and 37.0 million U.S. dollars into 145.6 million NIS.    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 1,800,000    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 800,000    
Long-term Investments $ 1,600,000