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Note 12 - Segment Information (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Number of Operating Segments |  |  |  |  |  |  |  |  | 3 |  |
Business Combination, Acquisition Related Costs | $ 1,400 | $ 4,800 | $ 300 | $ 1,500 | $ 3,200 | $ 5,900 | $ 6,100 | $ 6,200 |  |  |
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  | $ 14,809 |
Legal Fees | $ 700 | $ 1,500 |  |  | 1,200 | $ 900 | 100 | 400 |  |  |
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | Outside the United States [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 69.00% |  |
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | CHINA |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 26.00% |  |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Arrow Electronics Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.60% |  |
Facility Relocation [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | $ 100 |  | 700 | 1,000 |  |  |
Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  | $ 300 | $ 1,600 |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  | 4,600
Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  |  |  |  |  |  |  |  |  |  | 31,900
Legal Fees |  |  |  |  |  |  |  |  |  |  | 3,600
Cost of Sales [Member] | Facility Relocation [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  | $ 5,200
Other Segments [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  | $ 8,000 | 29,200 |
Restructuring Charges |  |  |  |  |  |  |  |  | $ 2,200 | 2,500 |
Other Segments [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  | 14,800 |
Other Segments [Member] | Cost of Sales [Member] | Facility Relocation [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  | 1,600 |
Other Segments [Member] | Operating Income (Loss) [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  | $ 1,900 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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