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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	[1]	$ 28,560	$ 29,397	$ 54,374	$ 48,279
UNITED STATES
Revenues	[1]	$ 18,419	$ 19,740	$ 34,056	$ 29,761
Revenue, percentage	[1]	64.00%	67.00%	63.00%	62.00%
Non-US [Member]
Revenues	[1]	$ 10,141	$ 9,657	$ 20,318	$ 18,518
Revenue, percentage	[1]	36.00%	33.00%	37.00%	38.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 24,036	$ 20,300	$ 44,797	$ 36,298
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	[1]	14,195	10,843	25,479	18,410
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	[1]	9,841	9,457	19,318	17,888
Communications Systems Segment [Member]
Revenues	[1]	4,524	9,097	9,577	11,981
Communications Systems Segment [Member] | UNITED STATES
Revenues	[1]	4,224	8,897	8,577	11,351
Communications Systems Segment [Member] | Non-US [Member]
Revenues	[1]	$ 300	$ 200	$ 1,000	$ 630
[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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
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