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Note 6 - Stockholders' Equity - Vested and Expected to Vest Option Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	May 27, 2018	May 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options Vested, Outstanding Number	1,383,732	1,021,097
Vested (in dollars per share)	$ 13.43
Vested (Year)	3 years 237 days
Vested	$ 1,122,822
Expected to vest (in shares)	571,603
Expected to vest (in dollars per share)	$ 12.63
Expected to vest (Year)	5 years 350 days
Expected to vest	$ 815,010
Total (in shares)	1,955,335
Total (in dollars per share)	$ 13.20
Total (Year)	4 years 120 days
Total	$ 1,937,832

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of expected to vest options outstanding.

+ References

No definition available.

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- Definition

As of the balance sheet date, the number of shares into which expected to vest stock options outstanding can be converted under the option plan.

+ References

No definition available.

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X

- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are expected to vest.

+ References

No definition available.

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- Definition

Weighted average remaining contractual term for expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested options outstanding.

+ References

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- Definition

As of the balance sheet date, the number of shares into which fully vested stock options outstanding can be converted under the option plan.

+ References

No definition available.

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- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested.

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- Definition

Weighted average remaining contractual term for fully vested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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-Section 50
-Paragraph 2
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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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