Note 6. Income Taxes	9 Months Ended
Sep. 30, 2018
Notes to Financial Statements
Income Taxes	We recognized income tax expense of $32,000 and $246,000 during the three and nine-month periods ended September 30, 2018, respectively, compared to $174,000 and $428,000 during the same periods of 2017. At the end of each interim period, we estimate the effective tax rate we expect to be applicable for the full fiscal year and this rate is applied to our pre-tax results for the year-to-date period, and then adjusted for any discrete period items. For the three and nine-month periods ended September 30, 2018, the variance between the Company’s effective tax rate and the U.S. statutory rate of 21% is primarily attributable to state income taxes, offset by excess stock-based compensation tax benefits and tax credits. The recently signed 2017 Act included a reduction in the federal corporate tax rate to 21% and other key provisions which were effective beginning January 1, 2018. The company has included these effects, as relevant, in the calculation of tax expense for the three and nine-month periods ended September 30, 2018.

Note 6. Income Taxes

9 Months Ended

Sep. 30, 2018

We recognized income tax expense of $32,000 and $246,000 during the three and nine-month periods ended September 30, 2018, respectively, compared to $174,000 and $428,000 during the same periods of 2017. At the end of each interim period, we estimate the effective tax rate we expect to be applicable for the full fiscal year and this rate is applied to our pre-tax results for the year-to-date period, and then adjusted for any discrete period items. For the three and nine-month periods ended September 30, 2018, the variance between the Company’s effective tax rate and the U.S. statutory rate of 21% is primarily attributable to state income taxes, offset by excess stock-based compensation tax benefits and tax credits.

The recently signed 2017 Act included a reduction in the federal corporate tax rate to 21% and other key provisions which were effective beginning January 1, 2018. The company has included these effects, as relevant, in the calculation of tax expense for the three and nine-month periods ended September 30, 2018.