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Note 9 - Income Taxes | 6 Months Ended
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Sep. 30, 2019
Notes to Financial Statements |
Income Tax Disclosure [Text Block] | Note 9 . Income Taxes For interim income tax reporting, we estimate our annual effective tax rate and apply this effective tax rate to our year-to-date pre-tax income. Each quarter, our estimate of the annual effective tax rate is updated, and if the estimated effective tax rate changes, a cumulative adjustment is made. Additionally, the tax effects of significant unusual or infrequently occurring items are recognized as discrete items in the interim period in which the events occur. The impact of changes in tax laws or rates on deferred tax amounts, impairments of non-deductible goodwill, excess benefits from stock-based compensation, and changes in tax reserves resulting from the finalization of tax audits or reviews are examples of significant unusual or infrequently occurring items that are recognized as discrete items in the interim period in which the event occurs. There is a potential for volatility of the effective tax rate due to several factors, including changes in the mix of the pre-tax income and the jurisdictions to which it relates, changes in tax laws and foreign tax holidays, settlement with taxing authorities, and foreign currency fluctuations. Our effective income tax rate was 16.4% and 23.9% for the three months ended September 30, 2019 and September 30, 2018, respectively and 15.1% and 8.4% for the six months ended September 30, 2019 and September 30, 2018 , respectively. The effective tax rate for the three and six months ended September 30, 2019 differed from the statutory federal rate of 21% primarily due to the benefit of share-based payment awards for employees, and research and development tax credits, partially offset by expenses for state income taxes, the limitations imposed by Section 162 (m), and the foreign rate differential. Since we are subject to audit by various taxing authorities, it is reasonably possible that the amount of unrecognized tax benefits will change during the next 12 months. However, we do not expect the change, if any, to have a material effect on our financial condition or results of operations within the next 12 months.

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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 + Details
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