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Note 8 - Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Apr. 30, 2013
Note 8 - Unrecognized Tax Benefits (Details) [Line Items]
Unrecognized Tax Benefits	$ 11,418		$ 8,938
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,422
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	388		286
Income Tax Examination, Penalties and Interest Expense	102	108
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	$ 1,507
2010 and Forward (Member)
Note 8 - Unrecognized Tax Benefits (Details) [Line Items]
Statute of Limitations for Federal Tax Years Open	2009 and forward

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Statute Of Limitations For Federal Tax Years Open

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

+ References

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)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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

+ References

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 50

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