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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Revenue	[1]	$ 29,397	$ 22,864	$ 48,279	$ 45,933
Revenue, percentage	[1]
Commercial [Member]
Revenue		$ 15,049	$ 10,254	$ 25,059	$ 19,880
Revenue, percentage		51.00%	45.00%	52.00%	43.00%
Government & Defense [Member]
Revenue		$ 14,348	$ 12,610	$ 23,220	$ 26,053
Revenue, percentage		49.00%	55.00%	48.00%	57.00%
Battery & Energy Products Segment [Member]
Revenue	[1]	$ 20,300	$ 17,831	$ 36,298	$ 35,055
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenue		15,049	10,254	25,059	19,880
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenue		5,251	7,577	11,239	15,175
Communications Systems Segment [Member]
Revenue	[1]	9,097	5,033	11,981	10,878
Communications Systems Segment [Member] | Commercial [Member]
Revenue
Communications Systems Segment [Member] | Government & Defense [Member]
Revenue		$ 9,097	$ 5,033	$ 11,981	$ 10,878
[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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