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Note 6 - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill	$ 16,283	$ 16,407	$ 16,419
Fair Value, Inputs, Level 1 [Member] | Battery And Energy Products
Goodwill	0
Trademark	0
Fair Value, Inputs, Level 1 [Member] | Communications Systems
Goodwill	0
Trademark	0
Fair Value, Inputs, Level 2 [Member] | Battery And Energy Products
Goodwill	0
Trademark	0
Fair Value, Inputs, Level 2 [Member] | Communications Systems
Goodwill	0
Trademark	0
Fair Value, Inputs, Level 3 [Member] | Battery And Energy Products
Goodwill	4,790
Trademark	711
Fair Value, Inputs, Level 3 [Member] | Communications Systems
Goodwill	11,493
Trademark	$ 2,700

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- References

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- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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