Note 10 - Segment Data (Details) - Financial Information from Reportable Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Net revenue from unaffiliated customers:
Net revenue	$ 82,166	$ 98,912	$ 160,577	$ 195,375
Gross profit (loss):
Gross profit	8,336	13,223	16,412	25,737
Operating income (loss):
Operating income (loss)	(689)	4,468	(7,570)	8,971
Industrial Group [Member]
Net revenue from unaffiliated customers:
Net revenue	74,432	82,850	145,581	165,372
Gross profit (loss):
Gross profit	8,858	8,906	16,968	18,828
Operating income (loss):
Operating income (loss)	5,976	6,097	11,361	13,453
Electronics Group [Member]
Net revenue from unaffiliated customers:
Net revenue	7,734	16,062	14,996	30,003
Gross profit (loss):
Gross profit	(522)	4,317	(556)	6,909
Operating income (loss):
Operating income (loss)	(4,444)	724	(14,595)	460
General, Corporate and Other [Member]
Operating income (loss):
Operating income (loss)	$ (2,221)	$ (2,353)	$ (4,336)	$ (4,942)

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- Definition

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

+ References

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- Definition

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

+ References

No definition available.

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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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