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Note 5 - Stockholders' Equity - Stock-based Compensation Activity (Details) - $ / shares | 12 Months Ended
--- | ---
May 29, 2016 | May 31, 2015 | May 25, 2014
Restricted Stock [Member] |  |  |
Balance (in shares) | 392,771 | 149,300 | 95,330
Balance (in dollars per share) | $ 14.15 | $ 13.17 | $ 6.52
Granted (in shares) | 177,675 | 324,357 | 128,631
Granted (in dollars per share) | $ 12.10 | $ 13.97 | $ 14.30
Awarded/Exercised (in shares) | (32,439) | (79,219) | (62,499)
Awarded/Exercised (in dollars per share) | $ 13.28 | $ 11.57 | $ 6.18
Forfeited (in shares) | (11,166) | (1,667) | (12,162)
Forfeited (in dollars per share) | $ 14.36 | $ 14.30 | $ 8.86
Balance (in shares) | 526,841 | 392,771 | 149,300
Balance (in dollars per share) | $ 13.51 | $ 14.15 | $ 13.17
Awarded/Exercised (in dollars per share) | 13.28 | 11.57 | 6.18
Forfeited (in dollars per share) | 14.36 | 14.30 | 8.86
Granted (in dollars per share) | $ 12.10 | $ 13.97 | $ 14.30
Employee Stock Option [Member] |  |  |
Balance (in shares) | 1,736,718 | 1,215,860 | 1,339,892
Balance (in dollars per share) | $ 11.19 | $ 8.45 | $ 6.58
Granted (in shares) | 265,500 | 794,500 | 291,500
Granted (in dollars per share) | $ 12.04 | $ 14.20 | $ 14.30
Awarded/Exercised (in shares) | (220,717) | (205,419) | (398,080)
Awarded/Exercised (in dollars per share) | $ 6.44 | $ 6.55 | $ 6.45
Forfeited (in shares) | (24,473) | (2,223) | (12,452)
Forfeited (in dollars per share) | $ 14.38 | $ 14.30 | $ 6.66
Plan shares expired (in shares) | (25,554) | (66,000) | (5,000)
Plan shares expired (in dollars per share) | $ 9.86 | $ 11.32 | $ 13.32
Balance (in shares) | 1,731,474 | 1,736,718 | 1,215,860
Balance (in dollars per share) | $ 11.90 | $ 11.19 | $ 8.45
Balance (in shares) | 881,143 | 2,000,000 | 422,977
Balance (in dollars per share) | $ 14.02 | $ 14.15 |
Additional shares reserved (in shares) |  |  | 2,000,000
Granted (in shares) | (443,175) | (1,118,857) | (420,131)
Plan shares expired (in shares) |  |  | (2,846)
Balance (in shares) | 465,968 | 881,143 | 2,000,000
Balance (in dollars per share) |  | $ 14.02 | $ 14.15
Forfeited (in shares) | 28,000 |  |

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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 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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