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Note 17 - Quarterly Data and Share Information (Unaudited) - Consolidated Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

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 sales

$ 266,210

$ 257,431

$ 251,700

$ 221,102

$ 239,507

$ 248,349

$ 248,207

$ 222,554

$ 996,443

^[4]

$ 958,617

^[4]

$ 1,001,863

^[4]

Gross profit

101,778

98,544

97,897

87,802

89,968

92,918

99,126

86,632

386,021

368,644

382,889

Net income

$ 4,322

$ 19,439

$ 20,938

$ 8,547

$ 4,707

$ 15,904

$ 20,657

$ 12,894

$ 53,246

$ 54,162

$ 72,418

Basic income per share (in dollars per share)

$ 0.07

$ 0.32

$ 0.33

$ 0.13

$ 0.07

$ 0.25

$ 0.32

$ 0.20

$ 0.86

$ 0.83

$ 1.10

Diluted income per share (in dollars per share)

0.07

0.32

0.33

0.13

0.07

0.25

0.32

0.20

0.86

0.83

$ 1.10

Maximum [Member]

Share prices (in dollars per share)

25.70

22.60

21.05

19.93

19.10

18.45

18.71

18.99

25.70

^[1]

19.10

^[3]

Minimum [Member]

Share prices (in dollars per share)

$ 21.21

$ 18.30

$ 18.15

$ 17.18

$ 14.59

$ 15.02

$ 14.56

$ 13.70

$ 21.21

^[1]

$ 14.59

^[3]

[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.
[4]	Revenue attributed to geographic areas is based on the location of the customer.

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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