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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Revenues	[1]	$ 29,397	$ 22,864	$ 48,279	$ 45,933
Revenue, percentage	[1]
UNITED STATES
Revenues	[1]	$ 19,740	$ 15,680	$ 29,761	$ 30,668
Revenue, percentage	[1]	67.00%	69.00%	62.00%	67.00%
Non-US [Member]
Revenues	[1]	$ 9,657	$ 7,184	$ 18,518	$ 15,265
Revenue, percentage	[1]	33.00%	31.00%	38.00%	33.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 20,300	$ 17,831	$ 36,298	$ 35,055
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	[1]	10,843	10,647	18,410	20,062
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	[1]	9,457	7,184	17,888	14,993
Communications Systems Segment [Member]
Revenues	[1]	9,097	5,033	11,981	10,878
Communications Systems Segment [Member] | UNITED STATES
Revenues	[1]	8,897	5,033	11,351	10,606
Communications Systems Segment [Member] | Non-US [Member]
Revenues	[1]	$ 200		$ 630	$ 272
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

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- 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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