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Note 6 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019		Dec. 31, 2018		Jul. 01, 2018
Goodwill balance	$ 20,109	[1]	$ 20,322		$ 20,458
Effect of foreign currency translation	(9)		(213)		(136)
Acquisition of SWE	6,474
Goodwill balance	26,574		20,109	[1]	20,322
Battery & Energy Products Segment [Member]
Goodwill balance	8,616		8,829		8,965
Effect of foreign currency translation	(9)		(213)		(136)
Acquisition of SWE	6,474
Goodwill balance	15,081		8,616		8,829
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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