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Note 13 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Revenues		$ 20,330,000	$ 21,047,000	$ 66,263,000	$ 63,022,000
Revenue, percentage	[1]
UNITED STATES
Revenues		$ 10,127,000	$ 10,817,000	$ 30,007,000	$ 30,988,000
Revenue, percentage		50.00%	51.00%	45.00%	49.00%
Non-US [Member]
Revenues		$ 10,203,000	$ 10,230,000	$ 36,256,000	$ 32,034,000
Revenue, percentage		50.00%	49.00%	55.00%	51.00%
Battery & Energy Products Segment [Member]
Revenues		$ 17,289,000	$ 18,616,000	$ 52,344,000	$ 52,977,000
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues		10,127,000	10,817,000	30,007,000	30,988,000
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues		7,162,000	7,799,000	22,337,000	21,989,000
Communications Systems Segment [Member]
Revenues		3,041,000	2,431,000	13,919,000	10,045,000
Communications Systems Segment [Member] | UNITED STATES
Revenues
Communications Systems Segment [Member] | Non-US [Member]
Revenues		$ 3,041,000	$ 2,431,000	$ 13,919,000	$ 10,045,000
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

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- Definition

The percentage of total revenue for the period.

+ References

No definition available.

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+ 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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