Note 5 - Stock-based Compensation (Details Textual) - USD ($) | 3 Months Ended |
Apr. 03, 2016 | Apr. 05, 2015 |
Employee Stock Option [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 87,500 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 8.75 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 87,500 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ 800,000 | |
Allocated Share-based Compensation Expense | $ 0 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 0 |
Restricted Stock [Member] | Minimum [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 2 years | |
Restricted Stock [Member] | Maximum [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | |
Restricted Stock [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 242,000 | 579,000 |
Allocated Share-based Compensation Expense | $ 1,000,000 | $ 4,500,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 7,000,000 | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 17.16 | |
Performance Shares [Member] | Minimum [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year | |
Performance Shares [Member] | Maximum [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | |
Performance Shares [Member] | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 418,200 | |
Allocated Share-based Compensation Expense | $ 300,000 | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 6,600,000 | |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Shares Issued During Exercise of Instrument, Upper Limit, Percentage | 200.00% | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 17.44 | |