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Note 5 Goodwill, Intangible Assets and Long Term Assets Goodwill Activity (Detail) (USD $)	3 Months Ended	9 Months Ended
	Dec. 31, 2013	Sep. 28, 2014	Sep. 29, 2013
Goodwill beginning	$ 16,405,000	$ 16,419,000	$ 16,344,000
Goodwill Translation Adjustments	14,000	(12,000)	61,000
Goodwill ending	16,419,000	16,407,000	16,405,000
Battery and Energy Products
Goodwill beginning	4,912,000	4,926,000	4,851,000
Goodwill Translation Adjustments	14,000	(12,000)	61,000
Goodwill ending	4,926,000	4,914,000	4,912,000
Communications Systems
Goodwill beginning	11,493,000	11,493,000	11,493,000
Goodwill Translation Adjustments	0	0	0
Goodwill ending	$ 11,493,000	$ 11,493,000	$ 11,493,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration