Note 5 - Income Taxes	3 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	5. Income Taxes Our effective income tax rate was 37.8% for the three-month period ended September 30, 2013, compared with 39.3% for the three-month period ended September 30, 2012. In determining our quarterly provision for income taxes, we use an estimated annual effective tax rate, which is based on our expected annual income, statutory tax rates, nontaxable and nondeductible items of income and expense, and the ultimate outcome of tax audits. 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. The Company follows ASC Topic 740-10-25 in accounting for uncertainty in income taxes ("Topic 740"). Topic 740 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. 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 2009 through 2011 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 September 30, 2013, the Company recorded a $0.5 million liability for unrecognized tax benefits, a portion of which represents penalties and interest.

Note 5 - Income Taxes

3 Months Ended

Sep. 30, 2013

5. Income Taxes

Our effective income tax rate was 37.8% for the three-month period ended September 30, 2013, compared with 39.3% for the three-month period ended September 30, 2012. In determining our quarterly provision for income taxes, we use an estimated annual effective tax rate, which is based on our expected annual income, statutory tax rates, nontaxable and nondeductible items of income and expense, and the ultimate outcome of tax audits. 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.

The Company follows ASC Topic 740-10-25 in accounting for uncertainty in income taxes ("Topic 740"). Topic 740 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. 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 2009 through 2011 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 September 30, 2013, the Company recorded a $0.5 million liability for unrecognized tax benefits, a portion of which represents penalties and interest.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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