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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 39,488	$ 33,234	$ 114,096	$ 95,733
UNITED STATES
Revenues	$ 20,274	$ 16,980	$ 58,258	$ 47,912
Revenue, percentage	51.00%	51.00%	51.00%	50.00%
Non-US [Member]
Revenues	$ 19,214	$ 16,254	$ 55,838	$ 47,821
Revenue, percentage	49.00%	49.00%	49.00%	50.00%
Commercial [Member]
Revenues	$ 24,150	$ 22,878	$ 73,319	$ 70,154
Revenue, percentage	61.00%	69.00%	64.00%	73.00%
Government & Defense [Member]
Revenues	$ 15,338	$ 10,356	$ 40,777	$ 25,579
Revenue, percentage	39.00%	31.00%	36.00%	27.00%
Battery & Energy Products Segment [Member]
Revenues	$ 31,919	$ 28,583	$ 94,250	$ 87,873
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	15,926	13,433	47,088	41,303
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	15,993	15,150	47,162	46,570
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	24,150	22,878	73,319	70,154
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	7,769	5,705	20,931	17,719
Communications Systems Segment [Member]
Revenues	7,569	4,651	19,846	7,860
Communications Systems Segment [Member] | UNITED STATES
Revenues	4,348	3,547	11,170	6,609
Communications Systems Segment [Member] | Non-US [Member]
Revenues	3,221	1,104	8,676	1,251
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 7,569	$ 4,651	$ 19,846	$ 7,860

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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-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
-Name Accounting Standards Codification
-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
-SubTopic 10
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-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-Section 50
-Paragraph 32
-Subparagraph (b)
-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
-Name Accounting Standards Codification
-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
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-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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-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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