Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

Note 8. Income Taxes

We generally calculate our effective income tax rate at the end of an interim period using an estimate of the annual effective income tax rate expected to be applicable for the full fiscal year. However, when a reliable estimate of the annual effective income tax rate cannot be made, we compute our provision for income taxes using the actual effective income tax rate for the year-to-date period. Our effective income tax rate is highly influenced by the amount of the nondeductible stock-based compensation associated with grants of our common stock options. A small change in estimated annual pretax income (loss) can produce a significant variance in the annual effective income tax rate given the expected amount of these items. Because of this variability, a reliable estimate of the annual effective income tax rate for 2013 cannot be made. As a result, we have computed our provision (benefit) for income taxes for the three and six month periods ended June 30, 2013 by applying the actual effective tax rate to income (loss) for the period.