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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 42,692	$ 32,126	$ 74,608	$ 62,499
UNITED STATES
Revenues	$ 21,339	$ 15,240	$ 37,984	$ 30,932
Revenue, percentage	50.00%	47.00%	51.00%	49.00%
Non-US [Member]
Revenues	$ 21,353	$ 16,886	$ 36,624	$ 31,567
Revenue, percentage	50.00%	53.00%	49.00%	51.00%
Commercial [Member]
Revenues	$ 26,950	$ 24,682	$ 49,169	$ 47,276
Revenue, percentage	63.00%	77.00%	66.00%	76.00%
Government & Defense [Member]
Revenues	$ 15,742	$ 7,444	$ 25,439	$ 15,223
Revenue, percentage	37.00%	23.00%	34.00%	24.00%
Battery & Energy Products Segment [Member]
Revenues	$ 33,861	$ 30,140	$ 62,331	$ 59,290
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	17,394	13,330	31,162	27,870
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	16,467	16,810	31,169	31,420
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	26,950	24,682	49,169	47,276
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	6,911	5,458	13,162	12,014
Communications Systems Segment [Member]
Revenues	8,831	1,986	12,277	3,209
Communications Systems Segment [Member] | UNITED STATES
Revenues	3,945	1,910	6,822	3,062
Communications Systems Segment [Member] | Non-US [Member]
Revenues	4,886	76	5,455	147
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 8,831	$ 1,986	$ 12,277	$ 3,209

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
-Name Accounting Standards Codification
-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
-Name Accounting Standards Codification
-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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-Section 50
-Paragraph 22
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-Publisher FASB
-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
-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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