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Note 6 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018		Sep. 29, 2019		Sep. 30, 2018
Goodwill balance	$ 20,201		$ 20,109	[1]	$ 20,458
Effect of foreign currency translation	(92)		(210)		(257)
Acquisition of SWE			6,474
Goodwill balance	20,109	[1]	26,373		20,201
Battery & Energy Products Segment [Member]
Goodwill balance	8,708		8,616		8,965
Effect of foreign currency translation	(92)		(210)		(257)
Acquisition of SWE			6,474
Goodwill balance	8,616		14,880		8,708
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.

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

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-Name Accounting Standards Codification
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