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Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill balance	$ 27,018
Effect of foreign currency translation	31
Goodwill balance	38,068
UEHC [Member]
Acquisition of Excell	11,019
Goodwill balance	11,019
Battery & Energy Products Segment [Member]
Goodwill balance	15,525
Effect of foreign currency translation	31
Goodwill balance	26,575
Battery & Energy Products Segment [Member] | UEHC [Member]
Acquisition of Excell	11,019
Communications Systems Segment [Member]
Goodwill balance	11,493
Effect of foreign currency translation	0
Goodwill balance	11,493
Communications Systems Segment [Member] | UEHC [Member]
Acquisition of Excell	$ 0

X

- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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- Definition

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+ References

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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