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Note 11 - Income (Loss) Per Share - Calculation of Income (Loss) Per Shares (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | [1] | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | [2] | Jan. 01, 2017 | [3] | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016
Net income | $ 4,322 | $ 19,439 | $ 20,938 | $ 8,547 | $ 4,707 | $ 15,904 | $ 20,657 | $ 12,894 | $ 53,246 | $ 54,162 | $ 72,418
Shares for Basic Earnings Per Share (in shares) |  |  |  |  |  |  |  |  | 61,996 | 65,098 | 66,027
Dilutive Effect of Stock Options (in shares) |  |  |  |  |  |  |  |  | 44 | 38 | 48
Shares for Diluted Earnings Per Share (in shares) |  |  |  |  |  |  |  |  | 62,040 | 65,136 | 66,075
Participating Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 400 | $ 400 | $ 1,600
Weighted Average Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 61,528 | 64,593 | 64,557
Participating Securities (in shares) |  |  |  |  |  |  |  |  | 468 | 505 | 1,470
[1] | Results for the fourth quarter of 2017 include tax charges of $15.2 million as a result of the recently enacted U.S. Tax Cuts and Jobs Act.
[2] | Results for the first quarter of 2017 include restructuring and asset impairment charges of $7.3 million.
[3] | Results for the fourth quarter of 2016 include restructuring and asset impairment charges of $19.8 million.

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