Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk (Details Textual)

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Financial Instruments and Risk (Details Textual)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Financial Instruments and Risk (Textual) [Abstract]    
Maturity period of securities One year or less  
Average days to maturity of Company's portfolio of cash equivalents and marketable securities 121 days 131 days