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Note 6 - Goodwill, Intangible Assets and Long Term Assets - Goodwill Activity by Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2015	Sep. 25, 2016	Sep. 27, 2015
Battery & Energy Products Segment [Member]
Balance	$ 4,834	$ 4,790	$ 4,914
Effect of Foreign Currency Translation	(44)	(466)	(80)
Balance – September 27, 2015	4,790	8,770	4,834
Acquisition of Accutronics		4,446
Communications Systems Segment [Member]
Balance	11,493	11,493	11,493
Effect of Foreign Currency Translation
Balance – September 27, 2015	11,493	11,493	11,493
Acquisition of Accutronics
Balance	16,327	16,283	16,407
Effect of Foreign Currency Translation	(44)	(466)	(80)
Balance – September 27, 2015	$ 16,283	20,263	$ 16,327
Acquisition of Accutronics		$ 4,446

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
-Subparagraph (a)
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

+ Details

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Period Type:	instant

X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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=35741047&loc=d3e13816-109267

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X

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type: