Note 6 - Stock-Based Compensation (Details) (USD $)	3 Months Ended	6 Months Ended
Nov. 24, 2013	Nov. 25, 2012	Nov. 24, 2013	Nov. 25, 2012
Note 6 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation	$ 361,000	$ 323,000	$ 639,000	$ 671,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	2,700,000		2,700,000
Restricted Stock Units (RSUs) [Member]
Note 6 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation	184,000	141,000	354,000	298,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 73 days
Employee Stock Option [Member]
Note 6 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation	$ 177,000	$ 182,000	$ 285,000	$ 373,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 6 months

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Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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