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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenue	[1]	$ 27,493	$ 20,330	$ 75,772	$ 66,263
Revenue, percentage	[1]
Commercial [Member]
Revenue		$ 17,677	$ 10,127	$ 42,736	$ 30,007
Revenue, percentage		64.00%	50.00%	56.00%	45.00%
Government & Defense [Member]
Revenue		$ 9,816	$ 10,203	$ 33,036	$ 36,256
Revenue, percentage		36.00%	50.00%	44.00%	55.00%
Battery & Energy Products Segment [Member]
Revenue	[1]	$ 22,578	$ 17,289	$ 58,876	$ 52,344
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenue		17,677	10,127	42,736	30,007
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenue		4,901	7,162	16,140	22,337
Communications Systems Segment [Member]
Revenue	[1]	4,915	3,041	16,896	13,919
Communications Systems Segment [Member] | Commercial [Member]
Revenue
Communications Systems Segment [Member] | Government & Defense [Member]
Revenue		$ 4,915	$ 3,041	$ 16,896	$ 13,919
[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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