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Note 6 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018 | Jul. 01, 2018
Goodwill balance | $ 20,109 | [1] | $ 20,322 |  | $ 20,458
Effect of foreign currency translation | (9) |  | (213) |  | (136)
Acquisition of SWE | 6,474 |  |  |  |
Goodwill balance | 26,574 |  | 20,109 | [1] | 20,322
Battery & Energy Products Segment [Member] |  |  |  |  |
Goodwill balance | 8,616 |  | 8,829 |  | 8,965
Effect of foreign currency translation | (9) |  | (213) |  | (136)
Acquisition of SWE | 6,474 |  |  |  |
Goodwill balance | 15,081 |  | 8,616 |  | 8,829
Communications Systems Segment [Member] |  |  |  |  |
Goodwill balance | 11,493 |  | 11,493 |  | 11,493
Effect of foreign currency translation |  |  |  |  |
Acquisition of SWE |  |  |  |  |
Goodwill balance | $ 11,493 |  | $ 11,493 |  | $ 11,493
[1] | Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Prior period balances have been adjusted for the effects of the new standard. See Note 1 for further information.

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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