Note 4 - Cash, Cash Equivalents and Short-Term Marketable Securities (Details) - Net Realized Gains (Losses) on Marketable Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jun. 30, 2013	Jul. 01, 2012
Net Realized Gains (Losses) on Marketable Securities [Abstract]
Gross realized gains	$ 218	$ 240
Gross realized losses	(277)	(278)
Net realized losses	$ (59)	$ (38)

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

+ Details

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

+ Details

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

+ Details

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