Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Tax (Textual) [Abstract]        
Increase in liability for unrecognized tax benefit $ 1,000 $ 1,000 $ 2,000 $ 2,000