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Note 6 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2019		Apr. 01, 2018	Dec. 31, 2018
Goodwill balance	$ 20,109	[1]	$ 20,458	$ 20,698
Effect of Foreign Currency Translation	142		240	(589)
Goodwill balance	20,251		20,698	20,109	[1]
Battery & Energy Products Segment [Member]
Goodwill balance	8,616		8,965	9,205
Effect of Foreign Currency Translation	142		240	(589)
Goodwill balance	8,758		9,205	8,616
Communications Systems Segment [Member]
Goodwill balance	11,493		11,493	11,493
Effect of Foreign Currency Translation
Goodwill balance	$ 11,493		$ 11,493	$ 11,493
[1] Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Shareholders’ equity as of December 31, 2018 has 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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