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Note 12 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Revenues	$ 22,864	$ 19,939	$ 45,933	$ 41,974
Revenue, percentage
UNITED STATES
Revenues	$ 10,254	$ 10,818	$ 19,880	$ 20,170
Revenue, percentage	45.00%	54.00%	43.00%	48.00%
Non-US [Member]
Revenues	$ 12,610	$ 9,121	$ 26,053	$ 21,804
Revenue, percentage	55.00%	46.00%	57.00%	52.00%
Battery & Energy Products Segment [Member]
Revenues	$ 17,831	$ 16,880	$ 35,055	$ 34,359
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	10,254	10,818	19,880	20,170
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	7,577	6,062	15,175	14,189
Communications Systems Segment [Member]
Revenues	5,033	3,059	10,878	7,615
Communications Systems Segment [Member] | UNITED STATES
Revenues
Communications Systems Segment [Member] | Non-US [Member]
Revenues	$ 5,033	$ 3,059	$ 10,878	$ 7,615

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

+ Details

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X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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