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Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill balance | $ 19,965 | $ 16,283
Effect of Foreign Currency Translation | 493 | (805)
Goodwill balance | 20,458 | 19,965
Accutronics Limited [Member] |  |
Acquisition of Accutronics |  | 4,487
Battery & Energy Products Segment [Member] |  |
Goodwill balance | 8,472 | 4,790
Effect of Foreign Currency Translation | 493 | (805)
Goodwill balance | 8,965 | 8,472
Battery & Energy Products Segment [Member] | Accutronics Limited [Member] |  |
Acquisition of Accutronics |  | 4,487
Communications Systems Segment [Member] |  |
Goodwill balance | 11,493 | 11,493
Effect of Foreign Currency Translation |  |
Goodwill balance | $ 11,493 | 11,493
Communications Systems Segment [Member] | Accutronics Limited [Member] |  |
Acquisition of Accutronics |  |

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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 -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=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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