Note 4 - Income Taxes

6 Months Ended

Jun. 30, 2012

Income Tax Disclosure [Text Block]

Note 4.   Income Taxes

Income tax expense varies from the amount computed by applying the federal corporate income tax rate of 35% to income (loss) 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 who meet the requirements to receive per diem are generally required 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, while in periods where earnings are at or near breakeven the impact of the per diem program on our effective tax rate is significant.  Due to the partially nondeductible effect of per diem pay, our tax rate will fluctuate in future periods based on fluctuations in earnings.

Our liability recorded for uncertain tax positions as of June 30, 2012 has not changed significantly in amount or composition since December 31, 2011.

The carrying value of our deferred tax assets assumes that we will be able to generate, based on certain estimates and assumptions, sufficient future taxable income in certain tax jurisdictions to utilize these deferred tax benefits.  If these estimates and related assumptions change in the future, we may be required to establish a valuation allowance against the carrying value of the deferred tax assets, which would result in additional income tax expense.  On a periodic basis, we assess the need for adjustment of the valuation allowance.  Based on forecasted taxable income resulting from the reversal of deferred tax liabilities, primarily generated by accelerated depreciation for tax purposes in prior periods, and tax planning strategies available to us, no valuation allowance has been established at June 30, 2012, except for $0.3 million related to certain state net operating loss carry-forwards.  If these estimates and related assumptions change in the future, we may be required to modify our valuation allowance against the carrying value of the deferred tax assets.