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Income Taxes
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Income Taxes
5.   Income Taxes
    Provision for income taxes is based upon the estimated annual effective tax rate. The effective tax rate for the nine months ended September 30, 2011 and 2010 was 45.8% and 53.1%, respectively. The difference in the effective rate from the statutory rate is primarily due to a change in the valuation allowance of approximately $39,000 and $7,000 in 2011 and 2010, respectively.