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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of (increase) decrease reasonably possible in the estimated lower bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Note 8 - Unrecognized Tax Benefits (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Apr. 30, 2014
Disclosure Text Block [Abstract]
Unrecognized Tax Benefits	$ 10,212		$ 9,244
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,760
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	217		402
Income Tax Examination, Penalties and Interest Expense	185	102
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	$ 2,561
Domestic Tax Authority [Member] \| Earliest Tax Year [Member]
Disclosure Text Block [Abstract]
Open Tax Year	2010
State and Local Jurisdiction [Member] \| Earliest Tax Year [Member]
Disclosure Text Block [Abstract]
Open Tax Year	2009