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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 |

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- 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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- 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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- 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 + Details
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