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Note 3 - Supplemental Balance Sheet Information (Details) - Goodwill Activity (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Battery & Energy Products [Member]	Dec. 31, 2012 Battery & Energy Products [Member]	Dec. 31, 2013 Communications Systems [Member]	Dec. 31, 2012 Communications Systems [Member]	Dec. 31, 2011 Communications Systems [Member]	Dec. 31, 2012 Discontinued Operations [Member]
Goodwill [Line Items]
Balance	$ 16,344	$ 18,356	$ 4,851	$ 4,838	$ 11,493	$ 11,493	$ 11,493	$ 2,025
Sale of RedBlack Communications		(2,025)						(2,025)
Effect of foreign currency translations	75	13	75	13
Balance	$ 16,419	$ 16,344	$ 4,926	$ 4,851	$ 11,493	$ 11,493	$ 11,493

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

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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

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X

- Definition

Amount of divestiture 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 (d)

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

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