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Note 13 - Business Segment Information - Revenue by Business Segment Sector (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]
Commercial [Member]
Revenues		$ 11,529,000	$ 11,305,000	$ 42,198,000	$ 35,231,000
Revenue, percentage	[1]	57.00%	54.00%	64.00%	56.00%
Government & Defense [Member]
Revenues		$ 8,801,000	$ 9,742,000	$ 24,065,000	$ 27,791,000
Revenue, percentage	[1]	43.00%	46.00%	36.00%	44.00%
Battery & Energy Products Segment [Member]
Revenues		$ 17,289,000	$ 18,616,000	$ 52,344,000	$ 52,977,000
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues		9,389,000	9,161,000	29,451,000	25,832,000
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues		7,900,000	9,455,000	22,893,000	27,145,000
Communications Systems Segment [Member]
Revenues		3,041,000	2,431,000	13,919,000	10,045,000
Communications Systems Segment [Member] | Commercial [Member]
Revenues		2,140,000	2,144,000	12,747,000	9,399,000
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues		$ 901,000	$ 287,000	$ 1,172,000	$ 646,000
[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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