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Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity (USD $) | 12 Months Ended
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May 25, 2014 | May 26, 2013 | May 27, 2012
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity [Line Items] |  |  |
RSUs and options available for grant | 422,977 | 449,643 | 640,976
Weighted average exercise price (in Dollars per share) | $ 12.80 | $ 6.72 |
Additional shares reserved | 2,000,000 |  |
RSUs and options, granted | (420,131) | (26,666) | (191,333)
RSUs and options, plan shares expired | (2,846) |  |
RSUs and options available for grant | 2,000,000 | 422,977 | 449,643
Weighted average exercise price (in Dollars per share) | $ 14.15 | $ 12.80 | $ 6.72
Restricted Stock [Member] |  |  |
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity [Line Items] |  |  |
Restricted shares outstanding | 95,330 | 348,166 | 415,085
Weighted average grant date fair value (in Dollars per share) | $ 6.52 | $ 5.93 | $ 5.96
Restricted shares, granted | 128,631 | 6,666 | 47,833
Weighted average grant date fair value, granted (in Dollars per share) | $ 14.30 | $ 9.01 | $ 6.67
Restricted shares, awarded/exercised | (62,499) | (231,086) | (111,252)
Weighted average grant date fair value, awarded/exercised (in Dollars per share) | $ 6.18 | $ 5.74 | $ 6.36
Restricted shares, forfeited | (12,162) | (28,416) | (3,500)
Weighted average grant date fair value, forfeited (in Dollars per share) | $ 8.86 | $ 6.20 | $ 5.84
Restricted shares outstanding | 149,300 | 95,330 | 348,166
Weighted average grant date fair value (in Dollars per share) | $ 13.17 | $ 6.52 | $ 5.93
Employee Stock Option [Member] |  |  |
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity [Line Items] |  |  |
Stock options outstanding | 1,339,892 | 2,046,432 | 2,318,753
Weighted average exercise price (in Dollars per share) | $ 6.58 | $ 6.50 | $ 6.34
Stock options, granted | 291,500 | 20,000 | 143,500
Weighted average exercise price, granted (in Dollars per share) | $ 14.30 | $ 9.01 | $ 6.67
Stock options, awarded/exercised | (398,080) | (671,563) | (371,727)
Weighted average exercise price, awarded/exercised (in Dollars per share) | $ 6.45 | $ 6.30 | $ 5.40
Stock options, forfeited | (12,452) | (44,977) | (5,657)
Weighted average exercise price, forfeited (in Dollars per share) | $ 6.66 | $ 6.34 | $ 5.76
Stock options, plan shares expired | (5,000) | (10,000) | (38,437)
Weighted average exercise price, plan shares expired (in Dollars per share) | $ 13.32 | $ 13.32 | $ 8.23
Stock options outstanding | 1,215,860 | 1,339,892 | 2,046,432
Weighted average exercise price (in Dollars per share) | $ 8.45 | $ 6.58 | $ 6.50

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- Definition The weighted average grant date fair value of equity-based payment instruments, excluding stock (or unit) options, that exercised during the reporting period. + References No definition available. + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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 (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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