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Note 5 - Goodwill, Intangible Assets and Long Term Assets (Details) - Goodwill activity by segment (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jul. 01, 2012 | Dec. 31, 2011
Goodwill [Line Items] |  |  |  |
Balance at | $ 16,391 | $ 16,344 | $ 18,379 | $ 18,356
Sale of RedBlack Communications |  | (2,025) |  |
Effect of foreign currency translations | 47 | (10) | 23 |
Battery & Energy Products [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance at | 4,898 | 4,851 | 4,861 | 4,838
Effect of foreign currency translations | 47 | (10) | 23 |
Communications Systems [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance at | 11,493 | 11,493 | 11,493 | 11,493
Discontinued Operations [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance at |  |  | 2,025 | 2,025
Sale of RedBlack Communications |  | $ (2,025) |  |

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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- 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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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 + Details
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