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Note 5 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Goodwill balance | $ 26,753
Effect of foreign currency translation | (48)
Goodwill balance | 26,705
Battery & Energy Products Segment [Member] |
Goodwill balance | 15,260
Effect of foreign currency translation | (48)
Goodwill balance | 15,212
Communications Systems Segment [Member] |
Goodwill balance | 11,493
Effect of foreign currency translation | 0
Goodwill balance | $ 11,493

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