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Note 5 - Income Taxes
 9 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Text Block]
5.           Income Taxes

During the three months ended March 31, 2013 and 2012, our effective tax rates were 40.5% and 40.0%, respectively.  During the nine months ended March 31, 2013 and 2012, our effective tax rates were 38.8% and 39.3%, respectively.  Income tax expense varies from the amount computed by applying the statutory federal tax rate to income before income taxes primarily due to state income taxes, net of federal income tax effect, adjusted for permanent differences, the most significant of which is the effect of the per diem pay structure for drivers.  Drivers may elect to receive non-taxable per diem pay in lieu of a portion of their taxable wages.  This per diem program increases our drivers’ net pay per mile, after taxes, while decreasing gross pay, before taxes.  As a result, salaries, wages and employee benefits are slightly lower, and our effective income tax rate is higher than the statutory rate.  Generally, as pre-tax income increases, the impact of the driver per diem program on our effective tax rate decreases because aggregate per diem pay becomes smaller in relation to pre-tax income.  Due to the partially nondeductible effect of per diem pay, our tax rate will fluctuate in future periods based on fluctuations in earnings and in the number of drivers who elect to receive this pay structure.

We account for any uncertainty in income taxes by determining whether it is more likely than not that a tax position taken or expected to be taken in a tax return will be sustained upon examination by the appropriate taxing authority based on the technical merits of the position.  In that regard, we have analyzed filing positions in our federal and applicable state tax returns as well as in all open tax years.  The only periods subject to examination for our federal returns are the 2010 through 2012 tax years.  We believe that our income tax filing positions and deductions will be sustained on audit and do not anticipate any adjustments that will result in a material change to our consolidated financial position, results of operations and cash flows.  As of March 31, 2013, the Company recorded a $0.4 million liability for unrecognized tax benefits, a portion of which represents penalties and interest.