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Note 9 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 158,644	$ 131,840
UNITED STATES
Revenues	$ 81,396	$ 67,914
Revenue, percentage	51.00%	52.00%
Non-US [Member]
Revenues	$ 77,248	$ 63,926
Revenue, percentage	49.00%	48.00%
Commercial [Member]
Revenues	$ 100,842	$ 93,045
Revenue, percentage	64.00%	71.00%
Government & Defense [Member]
Revenues	$ 57,802	$ 38,795
Revenue, percentage	36.00%	29.00%
Battery & Energy Products Segment [Member]
Revenues	$ 129,953	$ 119,995
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	64,120	58,820
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	65,833	61,175
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	100,842	93,045
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	29,111	26,950
Communications Systems Segment [Member]
Revenues	28,691	11,845
Communications Systems Segment [Member] | UNITED STATES
Revenues	17,276	9,094
Communications Systems Segment [Member] | Non-US [Member]
Revenues	11,415	2,751
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 28,691	$ 11,845

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

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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
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-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
-Paragraph 42
-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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-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
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-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
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

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