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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues	$ 31,916	$ 30,373
UNITED STATES
Revenues	$ 16,645	$ 15,692
Revenue, percentage	52.00%	52.00%
Non-US [Member]
Revenues	$ 15,271	$ 14,681
Revenue, percentage	48.00%	48.00%
Commercial [Member]
Revenues	$ 22,219	$ 22,594
Revenue, percentage	70.00%	74.00%
Government & Defense [Member]
Revenues	$ 9,697	$ 7,779
Revenue, percentage	30.00%	26.00%
Battery & Energy Products Segment [Member]
Revenues	$ 28,470	$ 29,150
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	13,768	14,540
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	14,702	14,610
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	22,219	22,594
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	6,251	6,556
Communications Systems Segment [Member]
Revenues	3,446	1,223
Communications Systems Segment [Member] | UNITED STATES
Revenues	2,877	1,152
Communications Systems Segment [Member] | Non-US [Member]
Revenues	569	71
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 3,446	$ 1,223

X

- Definition

The percentage of total revenue for the period.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 41
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
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-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

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