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Note 6 - Stockholders' Equity - Stock-based Compensation Activity (Details) - $ / shares | 12 Months Ended
--- | ---
May 28, 2017 | May 29, 2016 | May 31, 2015
Balance (in shares) | 465,968 | 881,143 | 2,000,000
Balance (in dollars per share) |  | $ 14.02 |
Granted (in shares) | (370,522) | (443,175) | (1,118,857)
Forfeited (in shares) |  | (28,000) |
Balance (in shares) | 155,239 | 465,968 | 881,143
Balance (in dollars per share) | $ 13.58 |  | $ 14.02
Forfeited (in shares) |  | 28,000 |
Forfeited (in shares) | 59,793 |  |
Restricted Stock [Member] |  |  |
Balance (in shares) | 526,841 | 392,771 | 149,300
Balance (in dollars per share) | $ 13.51 | $ 14.15 | $ 13.17
Granted (in shares) | 130,522 | 177,675 | 324,357
Granted (in dollars per share) | $ 13.37 | $ 12.10 | $ 13.97
Awarded/Exercised (in shares) | (130,508) | (32,439) | (79,219)
Awarded/Exercised (in dollars per share) | $ 13.42 | $ 13.28 | $ 11.57
Forfeited (in shares) | (17,500) | (11,166) | (1,667)
Forfeited (in dollars per share) | $ 12.46 | $ 14.36 | $ 14.30
Balance (in shares) | 509,355 | 526,841 | 392,771
Balance (in dollars per share) | $ 13.53 | $ 13.51 | $ 14.15
Granted (in dollars per share) | $ 13.37 | $ 12.10 | $ 13.97
Forfeited (in shares) | 17,500 | 11,166 | 1,667
Employee Stock Option [Member] |  |  |
Balance (in shares) | 1,731,474 | 1,736,718 | 1,215,860
Balance (in dollars per share) | $ 11.90 | $ 11.19 | $ 8.45
Granted (in shares) | 240,000 | 265,500 | 794,500
Granted (in dollars per share) | $ 11.58 | $ 12.04 | $ 14.20
Awarded/Exercised (in shares) | (357,639) | (220,717) | (205,419)
Awarded/Exercised (in dollars per share) | $ 5.93 | $ 6.44 | $ 6.55
Forfeited (in shares) | (42,293) | (24,473) | (2,223)
Forfeited (in dollars per share) | $ 12.16 | $ 14.38 | $ 14.30
Plan shares expired (in shares) |  | (25,554) | (66,000)
Plan shares expired (in dollars per share) |  | $ 9.86 | $ 11.32
Balance (in shares) | 1,571,542 | 1,731,474 | 1,736,718
Balance (in dollars per share) | $ 13.20 | $ 11.90 | $ 11.19

X
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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 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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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