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Note 6 - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Goodwill | $ 16,283 | $ 16,407 | $ 16,419
Fair Value, Inputs, Level 1 [Member] | Battery And Energy Products |  |  |
Goodwill | 0 |  |
Trademark | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Communications Systems |  |  |
Goodwill | 0 |  |
Trademark | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Battery And Energy Products |  |  |
Goodwill | 0 |  |
Trademark | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Communications Systems |  |  |
Goodwill | 0 |  |
Trademark | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Battery And Energy Products |  |  |
Goodwill | 4,790 |  |
Trademark | 711 |  |
Fair Value, Inputs, Level 3 [Member] | Communications Systems |  |  |
Goodwill | 11,493 |  |
Trademark | $ 2,700 |  |

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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=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 + Details
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