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Income Taxes
3 Months Ended
Mar. 31, 2015
Income Taxes [Abstract]  
Income Taxes [Text Block]
5.Income Taxes

For the three months ending March 31, 2015, and 2014, the tax provision is approximately 34% and 35%, respectively, of book income before tax. The rate for the three months ended March 31, 2015 differed slightly from the statutory federal and state rates due primarily to permanent differences in book and taxable income related to stock compensation expense. The rate for the three months ended March 31, 2014 differed slightly from the statutory federal and state rates due primarily to permanent differences in book and taxable income related to the domestic production activities deduction.