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Note 11 - Income Taxes	6 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 11 - 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 pre-tax income and the jurisdictions to which it relates, changes in tax laws and foreign tax holidays, the impact of excess tax benefits and deficiencies associated with share-based payment awards to employees, settlements with taxing authorities and foreign currency fluctuations. Our effective income tax rate was 24.2 percent and 26.6 percent for the three months ended September 30, 2017 and 2016, respectively, and 12.2 percent and 20.3 percent for the six months ended September 30, 2017 and 2016, respectively. The effective tax rate for the three and six months ended September 30, 2017 differed from the statutory federal rate of 34 percent primarily due to the impact of share-based payment awards for employees (which was significant for the three and six months ended September 30, 2017), state income taxes, domestic manufacturing deductions and foreign rate differential. We anticipate that our effective tax rate for the year ending March 31, 2018 will approximate 36 percent to 39 percent, plus or minus the impact of excess tax benefits and deficiencies associated with share-based payment awards to employees (which may vary significantly from year to year). 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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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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