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Note 11 - Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |  |  | Aggregate |
|  |  |  |  |  | Weighted |  |  | Average |  |  | Intrinsic |
|  | Number of |  |  | Average |  |  | Remaining |  |  | Value |
|  | Shares |  |  | Exercise Price |  |  | Contractual Term |  |  | (in thousands) |
Outstanding, December 28, 2013 |  |  | 1,065,012 |  |  | $ | 8.72 |  |  |  |  |  |  |  |  |
Granted |  |  | 104,064 |  |  |  | 9.59 |  |  |  |  |  |  |  |  |
Exercised |  |  | 351,856 |  |  |  | 6.64 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 96,019 |  |  |  | 21.54 |  |  |  |  |  |  |  |  |
Canceled or expired |  |  | 6,750 |  |  |  | 8.78 |  |  |  |  |  |  |  |  |
Outstanding, January 3, 2015 |  |  | 714,451 |  |  |  | 8.14 |  |  |  |  |  |  |  |  |
Granted |  |  | 71,517 |  |  |  | 20.58 |  |  |  |  |  |  |  |  |
Exercised |  |  | 150,409 |  |  |  | 6.07 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 19,003 |  |  |  | 12.15 |  |  |  |  |  |  |  |  |
Canceled or expired |  |  | 41,705 |  |  |  | 32.95 |  |  |  |  |  |  |  |  |
Outstanding, January 2, 2016 |  |  | 574,851 |  |  |  | 8.30 |  |  |  |  |  |  |  |  |
Granted |  |  | 213,156 |  |  |  | 13.68 |  |  |  |  |  |  |  |  |
Exercised |  |  | 30,223 |  |  |  | 5.91 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled or expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2016 |  |  | 757,784 |  |  | $ | 9.91 |  |  |  | 6.5 |  |  | $ | 3,369 |
Options Exercisable As Of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2016 |  |  | 427,527 |  |  | $ | 7.32 |  |  |  | 5.0 |  |  | $ | 2,902 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Dividend yield |  |  |  | 0% |  |  |  |  |  | 0% |  |  |  |  |  | 0% |  |
Historical volatility |  |  | 52% | - | 55% |  |  |  | 51% | - | 58% |  |  |  |  | 65% |  |
Risk-free rate |  |  | 1.4% | - | 1.6% |  |  |  | 1.5% | - | 1.8% |  |  |  | 1.7 | - | 2.1% |
Expected life (years) |  |  |  | 6 |  |  |  |  |  | 6 |  |  |  |  | 6 | - | 6.25 |
Weighted average grant date fair value |  |  |  | $7.13 |  |  |  |  |  | $11.20 |  |  |  |  |  | $5.80 |  |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Restricted Stock |  |  | Performance Shares |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |  |  | Number of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Outstanding, December 28, 2013 |  |  | 720,198 |  |  | $ | 5.91 |  |  |  | — |  |  | $ | - |
Granted |  |  | 202,274 |  |  |  | 10.31 |  |  |  | — |  |  |  | — |
Vested |  |  | 345,577 |  |  |  | 6.25 |  |  |  | — |  |  |  | — |
Forfeited |  |  | 157,221 |  |  |  | 6.21 |  |  |  | — |  |  |  | — |
Outstanding, January 3, 2015 |  |  | 419,674 |  |  |  | 7.64 |  |  |  | — |  |  |  | — |
Granted |  |  | 107,004 |  |  |  | 19.59 |  |  |  | 86,222 |  |  |  | 20.71 |
Vested |  |  | 205,137 |  |  |  | 7.84 |  |  |  | — |  |  |  | — |
Forfeited |  |  | 44,988 |  |  |  | 8.89 |  |  |  | 2,160 |  |  |  | 20.80 |
Canceled |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, January 2, 2016 |  |  | 276,553 |  |  |  | 11.93 |  |  |  | 84,062 |  |  |  | 20.70 |
Granted |  |  | 203,613 |  |  |  | 13.58 |  |  |  | 176,611 |  |  |  | 13.68 |
Vested |  |  | 152,548 |  |  |  | 11.22 |  |  |  | 7,039 |  |  |  | 20.56 |
Forfeited |  |  | 11,502 |  |  |  | 13.45 |  |  |  | — |  |  |  | — |
Canceled |  |  | — |  |  |  | — |  |  |  | 12,493 |  |  |  | 20.56 |
Outstanding, December 31, 2016 |  |  | 316,116 |  |  | $ | 13.30 |  |  |  | 241,141 |  |  | $ | 15.39 |

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