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Note 5 - Stockholders' Equity - Stock-based Compensation Activity (Details) - $ / shares | 12 Months Ended
--- | ---
May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Restricted Stock [Member] |  |  |
Balance (in shares) | 149,300 | 95,330 | 348,166
Balance (in dollars per share) | $ 13.17 | $ 6.52 | $ 5.93
Granted (in shares) | 324,357 | 128,631 | 6,666
Granted (in dollars per share) | $ 13.97 | $ 14.30 | $ 9.01
Awarded/Exercised (in shares) | (79,219) | (62,499) | (231,086)
Awarded/Exercised (in dollars per share) | $ 11.57 | $ 6.18 | $ 5.74
Forfeited (in shares) | (1,667) | (12,162) | (28,416)
Forfeited (in dollars per share) | $ 14.30 | $ 8.86 | $ 6.20
Balance (in shares) | 392,771 | 149,300 | 95,330
Balance (in dollars per share) | $ 14.15 | $ 13.17 | $ 6.52
Awarded/Exercised (in dollars per share) | 11.57 | 6.18 | 5.74
Forfeited (in dollars per share) | $ 14.30 | $ 8.86 | 6.20
Plan shares expired (in shares) |  |  |
Granted (in dollars per share) | $ 13.97 | $ 14.30 | $ 9.01
Plan shares expired (in shares) |  |  |
Employee Stock Option [Member] |  |  |
Balance (in shares) | 1,215,860 | 1,339,892 | 2,046,432
Balance (in dollars per share) | $ 8.45 | $ 6.58 | $ 6.50
Granted (in shares) | 794,500 | 291,500 | 20,000
Granted (in dollars per share) | $ 14.20 | $ 14.30 | $ 9.01
Awarded/Exercised (in shares) | (205,419) | (398,080) | (671,563)
Awarded/Exercised (in dollars per share) | $ 6.55 | $ 6.45 | $ 6.30
Forfeited (in shares) | (2,223) | (12,452) | (44,977)
Forfeited (in dollars per share) | $ 14.30 | $ 6.66 | $ 6.34
Plan shares expired (in shares) | (66,000) | (5,000) | (10,000)
Plan shares expired (in dollars per share) | $ 11.32 | $ 13.32 | $ 13.32
Balance (in shares) | 1,736,718 | 1,215,860 | 1,339,892
Balance (in dollars per share) | $ 11.19 | $ 8.45 | $ 6.58
Balance (in shares) | 2,000,000 | 422,977 | 449,643
Balance (in dollars per share) | $ 14.15 | $ 12.80 |
Granted (in shares) | (1,118,857) | (420,131) | (26,666)
Awarded/Exercised (in shares) | 0 | 0 |
Balance (in shares) | 881,143 | 2,000,000 | 422,977
Balance (in dollars per share) | $ 14.02 | $ 14.15 | $ 12.80
Additional shares reserved (in shares) |  | 2,000,000 |
Plan shares expired (in shares) |  | (2,846) |

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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 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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