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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenues	[1]	$ 27,493	$ 20,330	$ 75,772	$ 66,263
Revenue, percentage	[1]
UNITED STATES
Revenues	[1]	$ 15,856	$ 11,529	$ 45,617	$ 42,198
Revenue, percentage	[1]	58.00%	57.00%	60.00%	64.00%
Non-US [Member]
Revenues	[1]	$ 11,637	$ 8,801	$ 30,155	$ 24,065
Revenue, percentage	[1]	42.00%	43.00%	40.00%	36.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 22,578	$ 17,289	$ 58,876	$ 52,344
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	[1]	11,459	9,389	29,869	29,451
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	[1]	11,119	7,900	29,007	22,893
Communications Systems Segment [Member]
Revenues	[1]	4,915	3,041	16,896	13,919
Communications Systems Segment [Member] | UNITED STATES
Revenues	[1]	4,397	2,140	15,748	12,747
Communications Systems Segment [Member] | Non-US [Member]
Revenues	[1]	$ 518	$ 901	$ 1,148	$ 1,172
[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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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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