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Note 10 - Income Taxes
9 Months Ended
Dec. 31, 2015
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 31.6 and 35.3 percent for the three months ended December 31, 2015 and 2014, respectively and 34.3 and 35.3 percent for the nine months ended December 31, 2015 and 2014, respectively. The effective tax rate for the three and nine months ended December 31, 2015 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 and certain discrete period items. We anticipate that our effective tax rate for the year ending March 31, 2016 will approximate 34 to 37 percent.