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Note 5 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill balance | $ 26,753 | $ 20,109
Acquisition of SWE |  | 6,534
Effect of foreign currency translation | 265 | 110
Goodwill balance | 27,018 | 26,753
Battery & Energy Products Segment [Member] |  |
Goodwill balance | 15,260 | 8,616
Acquisition of SWE |  | 6,534
Effect of foreign currency translation | 265 | 110
Goodwill balance | 15,525 | 15,260
Communications Systems Segment [Member] |  |
Goodwill balance | 11,493 | 11,493
Acquisition of SWE |  | 0
Effect of foreign currency translation | 0 | 0
Goodwill balance | $ 11,493 | $ 11,493

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