Note 11 - Segment Data (Details) - Financial Information From Reportable Segments - Income Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 30, 2014	Mar. 31, 2013
Net revenue from unaffiliated customers:
Net revenue	$ 84,244	$ 78,411
Gross profit (loss):
Gross profit	10,564	8,076
Operating income (loss):
Operating Income (loss)	2,421	(6,881)
Industrial Group [Member]
Net revenue from unaffiliated customers:
Net revenue	75,839	71,149
Gross profit (loss):
Gross profit	11,154	8,110
Operating income (loss):
Operating Income (loss)	8,113	5,385
Electronics Group [Member]
Net revenue from unaffiliated customers:
Net revenue	8,405	7,262
Gross profit (loss):
Gross profit	(590)	(34)
Operating income (loss):
Operating Income (loss)	(3,077)	(10,151)
General, Corporate and Other [Member]
Operating income (loss):
Operating Income (loss)	$ (2,615)	$ (2,115)

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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