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Note 10 - Income Taxes	9 Months Ended
Note 10 - Income Taxes	Dec. 31, 2016
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 10 – 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, the estimate of the annual effective tax rate is updated, and if the estimated effective tax rate changes, a cumulative adjustment is made. 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 16.2 and 24.7 percent for the three months ended December 31, 2016 and 2015, respectively, and 18.6 and 26.5 percent for the nine months ended December 31, 2016 and 2015, respectively. The effective tax rate for the three and nine months ended December 31, 2016 differed from the statutory federal rate of 35 percent primarily as a result of the impact of state income taxes, domestic manufacturing deductions, research and development tax credits, foreign rate differential and share-based payment awards for employees. We anticipate that our effective tax rate for the year ending March 31, 2017 will approximate 22 to 25 percent, plus or minus the fourth -quarter impact of excess tax benefits and deficiencies associated with share-based payment awards to employees. The excess tax benefits and deficiencies associated with share-based payment awards to our employees have and, in the future, may cause large fluctuations in our realized effective tax rate based on the timing, volume, and nature of stock options exercised under our share-based payment program. During the nine months ended December 31, 2016, the IRS examination of our tax year ended March 31, 2015 was completed with no change to the reported tax liability. We have reserved for any other potential adjustments for income taxes that may result from future examinations by tax authorities, and we believe the final outcome of these examinations or agreements will not have a material effect on our financial condition, results of operations or cash flows. 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.