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Acquisitions (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013
Specialty Pipe And Tube, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Pro forma revenues | $ 228,647 | $ 224,570
Pro forma net income | $ 8,928 | $ 6,459
Earnings per share: |  |
Basic (dollars per share) | $ 1.85 | $ 0.93
Diluted (dollars per share) | $ 1.85 | $ 0.93
CRI Tolling [Member] |  |
Business Acquisition [Line Items] |  |
Pro forma revenues |  | $ 223,969
Pro forma net income |  | $ 1,230
Earnings per share: |  |
Basic (dollars per share) |  | $ 0.18
Diluted (dollars per share) |  | $ 0.18

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