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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	[1]	$ 28,560	$ 29,397	$ 54,374	$ 48,279
Commercial [Member]
Revenue		$ 16,172	$ 15,049	$ 30,974	$ 25,059
Revenue, percentage		57.00%	51.00%	57.00%	52.00%
Government & Defense [Member]
Revenue		$ 12,388	$ 14,348	$ 23,400	$ 23,220
Revenue, percentage		43.00%	49.00%	43.00%	48.00%
Battery & Energy Products Segment [Member]
Revenue	[1]	$ 24,036	$ 20,300	$ 44,797	$ 36,298
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenue		16,172	15,049	30,974	25,059
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenue		7,864	5,251	13,823	11,239
Communications Systems Segment [Member]
Revenue	[1]	4,524	9,097	9,577	11,981
Communications Systems Segment [Member] | Commercial [Member]
Revenue		0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenue		$ 4,524	$ 9,097	$ 9,577	$ 11,981
[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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The percentage of total revenue for the period.

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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)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 280
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 606
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
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