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Note 4 - Diluted Net Income Per Share - Diluted Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 01, 2015	Feb. 23, 2014	Mar. 01, 2015	Feb. 23, 2014
Numerator:
Net income	$ 3,772us-gaap_NetIncomeLoss	$ 6,400us-gaap_NetIncomeLoss	$ 9,348us-gaap_NetIncomeLoss	$ 14,603us-gaap_NetIncomeLoss
Denominator:
Weighted average shares for basic net income per share (in shares)	26,886us-gaap_WeightedAverageNumberOfSharesIssuedBasic	26,697us-gaap_WeightedAverageNumberOfSharesIssuedBasic	26,863us-gaap_WeightedAverageNumberOfSharesIssuedBasic	26,574us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Effect of dilutive securities:
Stock options and restricted stock units (in shares)	477us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	427us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	451us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	519us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares for diluted net income per share (in shares)	27,363us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	27,124us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	27,314us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	27,093us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per share (in dollars per share)	$ 0.14us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.54us-gaap_EarningsPerShareDiluted

X

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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X

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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