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Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill balance $ 27,018
Effect of foreign currency translation (20)
Goodwill balance 26,998
Battery & Energy Products Segment [Member]  
Goodwill balance 15,525
Effect of foreign currency translation (20)
Goodwill balance 15,505
Communications Systems Segment [Member]  
Goodwill balance 11,493
Effect of foreign currency translation 0
Goodwill balance $ 11,493