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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Revenue	[1]	$ 106,795	$ 87,190
Revenue, percentage	[1]
UNITED STATES
Revenue	[1]	$ 63,375	$ 53,054
Revenue, percentage	[1]	59.00%	61.00%
Non-US [Member]
Revenue	[1]	$ 43,420	$ 34,136
Revenue, percentage	[1]	41.00%	39.00%
Battery & Energy Products Segment [Member]
Revenue	[1]	$ 83,996	$ 70,497
Battery & Energy Products Segment [Member] | UNITED STATES
Revenue	[1]	42,224	37,898
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenue	[1]	41,772	32,599
Communications Systems Segment [Member]
Revenue	[1]	22,799	16,693
Communications Systems Segment [Member] | UNITED STATES
Revenue	[1]	21,151	15,156
Communications Systems Segment [Member] | Non-US [Member]
Revenue	[1]	$ 1,648	$ 1,537
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

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X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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