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Note 13 - Business Segment Information (Details narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Foreign
Long-lived assets held outside the U.S.	$ 4,748	$ 5,153
Battery & Energy Products Revenue	28,200	26,100
Communications Systems Revenue	1,500	1,000
United States
Battery & Energy Products Revenue	37,100	30,700
Communications Systems Revenue	$ 9,600	$ 8,700

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599

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