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Note 8 - Income Taxes	9 Months Ended
	Sep. 30, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	8 . Income Taxes Our effective income tax rate was 20.4% for the three months ended September 30, 2018, compared to 35.9% for the three months ended September 30, 2017. Our effective income tax rate was 24.3% for the first nine months of 2018, compared to 33.9% in 2017. In determining our quarterly provision for income taxes, we use an estimated annual effective tax rate, adjusted for discrete items. This rate is based on our expected annual income, statutory tax rates, best estimate of nontaxable and nondeductible items of income and expense, and the ultimate outcome of tax audits. The Tax Cuts and Jobs Act (the Act) was enacted in December 2017. Beginning in 2018, the Act reduced the U.S. federal corporate tax rate from 35% to 21%. We are applying the guidance in the Securities and Exchange Commission Staff Accounting Bulletin (SAB) No. 118 when accounting for the enactment-date effects of the Act. At September 30, 2018, we have not yet completed our accounting for all of the tax effects of the Act. However, we have made a reasonable estimate of the effects on our existing deferred tax assets and liabilities. We will continue to make and refine our calculations as additional analysis is completed. Our estimates may also be affected as we gain a more thorough understanding of the tax law. Our effective income tax rate for the first nine months of 2017 included the effect of a one -time after-tax benefit of $13.6 million for the claiming of federal research and development tax credits and domestic production tax deductions for the 2012 through 2016 tax years. At September 30, 2018, we had a total of $43.2 million in gross unrecognized tax benefits, which are a component of other long-term liabilities on our Condensed Consolidated Balance Sheets. Of this amount, $34.1 million represents the amount of unrecognized tax benefits that, if recognized, would impact our effective tax rate. The total amount of accrued interest and penalties for such unrecognized tax benefits was $4.1 million at September 30, 2018.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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