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Note 5 - Stockholders' Equity (Tables) | 12 Months Ended
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May. 31, 2015
Notes Tables |
Schedule of 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 27, 2012 |  |  | 449,643 |  |  |  | 348,166 |  |  | $ | 5.93 |  |  |  | 2,046,432 |  |  | $ | 6.50 |
Granted |  |  | (26,666 | ) |  |  | 6,666 |  |  | $ | 9.01 |  |  |  | 20,000 |  |  | $ | 9.01 |
Awarded/Exercised |  |  | — |  |  |  | (231,086 | ) |  | $ | 5.74 |  |  |  | (671,563 | ) |  | $ | 6.30 |
Forfeited |  |  | — |  |  |  | (28,416 | ) |  | $ | 6.20 |  |  |  | (44,977 | ) |  | $ | 6.34 |
Plan shares expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10,000 | ) |  | $ | 13.32 |
Balance at May 26, 2013 |  |  | 422,977 |  |  |  | 95,330 |  |  | $ | 6.52 |  |  |  | 1,339,892 |  |  | $ | 6.58 |
Additional shares reserved |  |  | 2,000,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Granted |  |  | (420,131 | ) |  |  | 128,631 |  |  | $ | 14.30 |  |  |  | 291,500 |  |  | $ | 14.30 |
Awarded/Exercised |  |  | — |  |  |  | (62,499 | ) |  | $ | 6.18 |  |  |  | (398,080 | ) |  | $ | 6.45 |
Forfeited |  |  | — |  |  |  | (12,162 | ) |  | $ | 8.86 |  |  |  | (12,452 | ) |  | $ | 6.66 |
Plan shares expired |  |  | (2,846 | ) |  |  | — |  |  |  | — |  |  |  | (5,000 | ) |  | $ | 13.32 |
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 |
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 |
$ 5.00 - $6.00 |  |  | 317,750 |  |  |  | 2.10 |  |  | $ | 5.65 |  |  | $ | 2,746,675 |  |  |  | 317,750 |  |  | $ | 5.65 |  |  | $ | 2,746,675 |
$ 6.01 - $9.00 |  |  | 315,191 |  |  |  | 1.83 |  |  | $ | 6.46 |  |  | $ | 2,466,904 |  |  |  | 315,191 |  |  | $ | 6.46 |  |  | $ | 2,466,904 |
$ 9.01 - $14.00 |  |  | 140,000 |  |  |  | 6.14 |  |  | $ | 12.57 |  |  | $ | 240,900 |  |  |  | 30,732 |  |  | $ | 10.55 |  |  | $ | 115,027 |
$14.01- $14.39 |  |  | 963,777 |  |  |  | 6.39 |  |  | $ | 14.36 |  |  | $ | — |  |  |  | 185,791 |  |  | $ | 14.30 |  |  | $ | — |
$ 5.00 - $14.39 |  |  | 1,736,718 |  |  |  | 4.76 |  |  | $ | 11.19 |  |  | $ | 5,454,479 |  |  |  | 849,464 |  |  | $ | 8.02 |  |  | $ | 5,328,606 |
Schedule of Share-based Compensation Arrangement 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 |  |  | 849,464 |  |  | $ | 8.02 |  |  |  | 2.74 |  |  | $ | 5,328,606 |
Expected to vest |  |  | 861,612 |  |  | $ | 14.22 |  |  |  | 6.69 |  |  |  | 123,261 |
Total |  |  | 1,711,076 |  |  | $ | 11.14 |  |  |  | 4.73 |  |  | $ | 5,451,867 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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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