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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 32,126	$ 26,770	$ 62,499	$ 52,743
UNITED STATES
Revenues	$ 15,240	$ 13,766	$ 30,932	$ 27,824
Revenue, percentage	47.00%	51.00%	49.00%	53.00%
Non-US [Member]
Revenues	$ 16,886	$ 13,004	$ 31,567	$ 24,919
Revenue, percentage	53.00%	49.00%	51.00%	47.00%
Battery & Energy Products Segment [Member]
Revenues	$ 30,140	$ 22,875	$ 59,290	$ 44,986
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	13,330	11,813	27,870	24,403
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	16,810	11,062	31,420	20,583
Communications Systems Segment [Member]
Revenues	1,986	3,895	3,209	7,757
Communications Systems Segment [Member] | UNITED STATES
Revenues	1,910	1,953	3,062	3,421
Communications Systems Segment [Member] | Non-US [Member]
Revenues	$ 76	$ 1,942	$ 147	$ 4,336

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

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