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Note 6 - Stockholders' Equity (Tables) | 12 Months Ended
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May 28, 2017
Notes Tables |
Share-based Compensation, Activity [Table Text Block] |
|  |  |  |  |  | Restricted Stock Outstanding |  |  | Stock Options Outstanding |
|  | RSUs and Options Available for Grant |  |  | Number of Restricted Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Stock Options |  |  | Weighted Average Exercise Price |
Balance at May 25, 2014 |  |  | 2,000,000 |  |  |  | 149,300 |  |  | $ | 13.17 |  |  |  | 1,215,860 |  |  | $ | 8.45 |
Granted |  |  | (1,118,857 | ) |  |  | 324,357 |  |  | $ | 13.97 |  |  |  | 794,500 |  |  | $ | 14.20 |
Awarded/Exercised |  |  | — |  |  |  | (79,219 | ) |  | $ | 11.57 |  |  |  | (205,419 | ) |  | $ | 6.55 |
Forfeited |  |  | — |  |  |  | (1,667 | ) |  | $ | 14.30 |  |  |  | (2,223 | ) |  | $ | 14.30 |
Plan shares expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (66,000 | ) |  | $ | 11.32 |
Balance at May 31, 2015 |  |  | 881,143 |  |  |  | 392,771 |  |  | $ | 14.15 |  |  |  | 1,736,718 |  |  | $ | 11.19 |
Granted |  |  | (443,175 | ) |  |  | 177,675 |  |  | $ | 12.10 |  |  |  | 265,500 |  |  | $ | 12.04 |
Awarded/Exercised |  |  | — |  |  |  | (32,439 | ) |  | $ | 13.28 |  |  |  | (220,717 | ) |  | $ | 6.44 |
Forfeited |  |  | 28,000 |  |  |  | (11,166 | ) |  | $ | 14.36 |  |  |  | (24,473 | ) |  | $ | 14.38 |
Plan shares expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (25,554 | ) |  | $ | 9.86 |
Balance at May 29, 2016 |  |  | 465,968 |  |  |  | 526,841 |  |  | $ | 13.51 |  |  |  | 1,731,474 |  |  | $ | 11.90 |
Granted |  |  | (370,522 | ) |  |  | 130,522 |  |  | $ | 13.37 |  |  |  | 240,000 |  |  | $ | 11.58 |
Awarded/Exercised |  |  | — |  |  |  | (130,508 | ) |  | $ | 13.42 |  |  |  | (357,639 | ) |  | $ | 5.93 |
Forfeited |  |  | 59,793 |  |  |  | (17,500 | ) |  | $ | 12.46 |  |  |  | (42,293 | ) |  | $ | 12.16 |
Plan shares expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance at May 28 2017 |  |  | 155,239 |  |  |  | 509,355 |  |  | $ | 13.53 |  |  |  | 1,571,542 |  |  | $ | 13.20 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number of Shares Outstanding |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Number of Shares Exercisable |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
| $5.77 | - | $14.39 |  |  |  | 1,571,542 |  |  |  | 4.68 |  |  | $ | 13.20 |  |  | $ | 1,362,499 |  |  |  | 1,021,097 |  |  | $ | 13.40 |  |  | $ | 752,758 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] |
|  | Outstanding Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contract Term (in years) |  |  | Aggregate Intrinsic Value |
Vested |  |  | 1,021,097 |  |  | $ | 13.40 |  |  |  | 4.18 |  |  |  | 752,758 |
Expected to vest |  |  | 550,445 |  |  | $ | 12.83 |  |  |  | 5.61 |  |  |  | 609,741 |
Total |  |  | 1,571,542 |  |  | $ | 13.20 |  |  |  | 4.68 |  |  |  | 1,362,499 |

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