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Note 8 - Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 14, 2010 | May 26, 2013 | May 27, 2012 | May 29, 2011 | May 24, 2013 | May 30, 2010
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Common Stock, Voting Rights |  | one |  |  |  |
Preferred Stock, Shares Authorized |  | 2,000,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 1,900,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 422,977 | 449,643 | 640,976 |  | 770,311
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation |  | 145,159 | 326,954 | 136,374 |  |
Payments Related to Tax Withholding for Share-based Compensation (in Dollars) |  | $ 49,000 | $ 260,000 | $ 218,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 3 years 3 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  | 1,262,934 | 1,620,562 |  |  |
Share Price (in Dollars per share) |  |  |  |  | $ 13.88 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars) |  | 4,100,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) |  | 418,000 |  |  |  |
Stock Repurchase Program, Authorized Amount (in Dollars) | 10,000,000 |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  | 917,244 | 215,684 |  |
Stock Repurchased and Retired During Period, Value (in Dollars) |  |  | $ 5,000,000 | $ 1,200,000 |  |
Optionee First Becomes Non-Employee Director [Member] | 1995 Directors' Stock Option Plan [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Shares Purchasable with Nonstatutory Stock Option |  | 20,000 |  |  |  |
Served on Board of Directors for at Least Six Months [Member] | 1995 Directors' Stock Option Plan [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Shares Purchasable with Nonstatutory Stock Option |  | 10,000 |  |  |  |
In the Money [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options |  | 1,262,934 |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 1,339,892 | 2,046,432 | 2,318,753 |  | 2,456,829
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  | 2 years |  |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 500,000 |  |  |  |
Stock Grants and Stock Units [Member] | Maximum [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 250,000 |  |  |  |
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 500,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 255 days |  |  |  |
Director [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance |  | 30,000 |  |  |  |
2005 Plan [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 861,038 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 344,300 |  |  |  |
1996 Non-Executive Stock Option Plan [Member] |  |  |  |  |  |
Note 8 - Stockholders' Equity (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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