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Income Taxes
6 Months Ended
Jun. 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 six months ended June 30, 2011 and 2010 differs significantly from the statutory rate primarily due to a change in the valuation allowance of approximately $47,000 and $55,000 in 2011 and 2010, respectively. The provision for income taxes for the three months ended June 30, 2011 approximates the statutory effective rate for the reported income before tax expense.