Note 8 - Stockholders' Equity (Details) - Summary of Stock Options Outstanding and Exercisable (USD $)	12 Months Ended
May 26, 2013
$5.63 - $5.63 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Limit	$ 5.63
Exercise Price, Upper Limit	$ 5.63
Number of Shares Outstanding (in Shares)	423,101
Weighted Average Remaining Contractual Life	4 years
Weighted Average Exercise Price	$ 5.63
Aggregate Intrinsic Value (in Dollars)	$ 3,490,583
Number of Shares Exercisable (in Shares)	423,101
Weighted Average Exercise Price	$ 5.63
Aggregate Intrinsic Value (in Dollars)	3,490,583
$5.65 - $6.22 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Limit	$ 5.65
Exercise Price, Upper Limit	$ 6.22
Number of Shares Outstanding (in Shares)	367,135
Weighted Average Remaining Contractual Life	3 years 208 days
Weighted Average Exercise Price	$ 6.15
Aggregate Intrinsic Value (in Dollars)	2,836,564
Number of Shares Exercisable (in Shares)	359,005
Weighted Average Exercise Price	$ 6.16
Aggregate Intrinsic Value (in Dollars)	2,772,504
$6.35 - $7.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Limit	$ 6.35
Exercise Price, Upper Limit	$ 7.50
Number of Shares Outstanding (in Shares)	443,656
Weighted Average Remaining Contractual Life	2 years 324 days
Weighted Average Exercise Price	$ 6.77
Aggregate Intrinsic Value (in Dollars)	3,153,362
Number of Shares Exercisable (in Shares)	391,496
Weighted Average Exercise Price	$ 6.79
Aggregate Intrinsic Value (in Dollars)	2,776,788
$8.19 - $13.32 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Limit	$ 8.19
Exercise Price, Upper Limit	$ 13.32
Number of Shares Outstanding (in Shares)	106,000
Weighted Average Remaining Contractual Life	2 years 113 days
Weighted Average Exercise Price	$ 11.09
Aggregate Intrinsic Value (in Dollars)	296,110
Number of Shares Exercisable (in Shares)	89,332
Weighted Average Exercise Price	$ 11.47
Aggregate Intrinsic Value (in Dollars)	214,937
$5.63 - $13.32 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower Limit	$ 5.63
Exercise Price, Upper Limit	$ 13.32
Number of Shares Outstanding (in Shares)	1,339,892
Weighted Average Remaining Contractual Life	3 years 138 days
Weighted Average Exercise Price	$ 6.58
Aggregate Intrinsic Value (in Dollars)	9,776,619
Number of Shares Exercisable (in Shares)	1,262,934
Weighted Average Exercise Price	$ 6.55
Aggregate Intrinsic Value (in Dollars)	$ 9,254,812

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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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.

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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 of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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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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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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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