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Note 10 - Income Taxes	6 Months Ended
	Sep. 30, 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 37.3 and 35.5 percent for the three months ended September 30, 2015 and 2014, respectively and 35.8 and 35.3 percent for the six months ended September 30, 2015 and 2014, respectively. The effective tax rate for the three and six months ended September 30, 2015 differed from the statutory federal rate of 35 percent primarily as a result of the impact of state income taxes and certain discrete period items. We anticipate that our effective tax rate for the year ending March 31, 2016 will approximate 35 to 37 percent.

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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.

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