Segments (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciling information between reportable segments' operating earnings before income taxes
Total segment operating earnings	$ 35,224	$ 28,378	$ 29,540
Interest expense	(2,564)	(2,119)	(1,074)
Interest income	1,725	1,257	385
Other income	1,093	1,959	872
Earnings before income taxes	26,942	26,337	28,026
Components and Sensors [Member]
Reconciling information between reportable segments' operating earnings before income taxes
Total segment operating earnings	26,128	21,356	31,353
Restructuring and restructuring-related charges	(4,501)	(2,649)	(1,010)
EMS [Member]
Reconciling information between reportable segments' operating earnings before income taxes
Total segment operating earnings	9,096	7,022	(1,813)
Restructuring and restructuring-related charges	$ (4,035)	$ (489)	$ (687)

Operating income loss before restructuring.

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Restructuring and related charges.

+ References

No definition available.

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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-Subparagraph (SX 210.4-08.(h)(1)(i))

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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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-Subsection II

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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-Paragraph 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 942

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-Section S99

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Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.

+ References

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Regulation S-X (SX)

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-Section 03

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-Subparagraph (SX 210.5-03.7(b))

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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