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Note 6 - Goodwill, Intangible Assets and Long Term Assets Goodwill Activity (Details) - USD ($)	6 Months Ended
	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014
Goodwill - beginning	$ 16,407,000	$ 16,403,000	$ 16,419,000
Effect of foreign currency translation	20,000	4,000	(16,000)
Goodwill - ending	16,427,000	16,407,000	16,403,000
Battery & Energy Products
Goodwill - beginning	4,914,000	4,910,000	4,926,000
Effect of foreign currency translation	20,000	4,000	(16,000)
Goodwill - ending	4,934,000	4,914,000	4,910,000
Communications Systems
Goodwill - beginning	11,493,000	11,493,000	11,493,000
Effect of foreign currency translation	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=35741047&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

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- 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



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