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Note 10 - Income Taxes	3 Months Ended
	Mar. 31, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	10 . Income Taxes The Company files income tax returns in the United States Federal jurisdiction, in a limited number of foreign jurisdictions, and in many state jurisdictions. With few exceptions, the Company is no longer subject to United States Federal, state, or foreign income tax examinations for years before 2014. The Company recorded an income tax expense (benefit) at an estimated effective income tax rate of 8.1% and 12.2% for the three months ended March  31, 2019 and 2018, respectively. The Company’s estimated effective income tax rate for the three months ended March  31, 2019 was impacted by the estimated changes in the Company’s valuation allowance. The Company had $4.4  million of unrecognized income tax benefits as of March  31, 2019 and December  31, 2018. The Company does not believe it is reasonably possible that the total amounts of unrecognized income tax benefits will change in the following twelve months; however, actual results could differ from those currently expected. Effectively all of the unrecognized income tax benefits would affect the Company’s effective income tax rate if recognized at some point in the future. The Company recognizes interest and penalties related to uncertain income tax positions in Income tax expense (benefit).

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- Definition

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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