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Note 7 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jul. 01, 2018 | Apr. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018 | Jul. 02, 2017
Stock Repurchased and Retired During Period, Value | $ 25,200 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 27,500 |  |  |  | 27,500 |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit |  |  |  |  | $ 12.43 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  | 10,000 | 10,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total |  |  |  |  | 5,000 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 100 |  |  |  | $ 100 |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | 0 | $ 0 |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 1,500 | $ 2,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 224,000 | 192,000 |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | 5,700 |  |  |  | $ 5,700 |  |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 1 year |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years |  |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 3,300 | $ 3,600 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 344,500 |  |
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 Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | 6,000 |  |  |  | $ 6,000 |  |
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 |  |
Restricted Stock and Performance Shares [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  | $ 900 |  |
Common Stock [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 100,000
Stock Repurchased and Retired During Period, Value | $ 156 | $ (0) | $ 0 | $ 61 |  |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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