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Note 6 - Stockholders' Equity - Stock Options Outstanding and Exercisable (Details) - USD ($)	12 Months Ended
	May 27, 2018	May 28, 2017
Lower Range of Exercise Prices (in dollars per share)	$ 6.66
Upper Range of Exercise Prices (in dollars per share)	$ 14.39
Options Outstanding Number of Shares Outstanding (in shares)	1,955,335
Options Outstanding Weighted Average Remaining Contractual Life (Year)	4 years 120 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance	$ 13.80	$ 13.58
Options Outstanding Aggregate Intrinsic Value	$ 1,937,832
Options Exercisable Number of Shares Exercisable (in shares)	1,383,732
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 13.43
Options Exercisable Aggregate Intrinsic Value	$ 1,122,822

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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