Note 5. Income Taxes	3 Months Ended
Mar. 31, 2018
Notes to Financial Statements
Income Taxes	We recognized an income tax benefit of $10,000 and an expense of $41,000 for the three-month periods ended March 31, 2018 and 2017, respectively. 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 results for the year-to-date period, and then adjusted for any discrete period items. For the three-month periods ended March 31, 2018 and 2017, the variance between the Company’s effective tax rate and the U.S. statutory rate applicable at the time is primarily attributable to excess stock-based compensation tax benefits of $73,000 and $77,000, respectively, recognized in income tax (benefit) expense during the periods, in connection with ASU 2016-09, as well as, foreign statutory tax rate differentials 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-month period ended March 31, 2018.

Note 5. Income Taxes

3 Months Ended

Mar. 31, 2018

We recognized an income tax benefit of $10,000 and an expense of $41,000 for the three-month periods ended March 31, 2018 and 2017, respectively. 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 results for the year-to-date period, and then adjusted for any discrete period items. For the three-month periods ended March 31, 2018 and 2017, the variance between the Company’s effective tax rate and the U.S. statutory rate applicable at the time is primarily attributable to excess stock-based compensation tax benefits of $73,000 and $77,000, respectively, recognized in income tax (benefit) expense during the periods, in connection with ASU 2016-09, as well as, foreign statutory tax rate differentials 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-month period ended March 31, 2018.