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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, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Revenues | [1] | $ 29,397 | $ 22,864 | $ 48,279 | $ 45,933
Revenue, percentage | [1] |  |  |  |
UNITED STATES |  |  |  |  |
Revenues | [1] | $ 19,740 | $ 15,680 | $ 29,761 | $ 30,668
Revenue, percentage | [1] | 67.00% | 69.00% | 62.00% | 67.00%
Non-US [Member] |  |  |  |  |
Revenues | [1] | $ 9,657 | $ 7,184 | $ 18,518 | $ 15,265
Revenue, percentage | [1] | 33.00% | 31.00% | 38.00% | 33.00%
Battery & Energy Products Segment [Member] |  |  |  |  |
Revenues | [1] | $ 20,300 | $ 17,831 | $ 36,298 | $ 35,055
Battery & Energy Products Segment [Member] | UNITED STATES |  |  |  |  |
Revenues | [1] | 10,843 | 10,647 | 18,410 | 20,062
Battery & Energy Products Segment [Member] | Non-US [Member] |  |  |  |  |
Revenues | [1] | 9,457 | 7,184 | 17,888 | 14,993
Communications Systems Segment [Member] |  |  |  |  |
Revenues | [1] | 9,097 | 5,033 | 11,981 | 10,878
Communications Systems Segment [Member] | UNITED STATES |  |  |  |  |
Revenues | [1] | 8,897 | 5,033 | 11,351 | 10,606
Communications Systems Segment [Member] | Non-US [Member] |  |  |  |  |
Revenues | [1] | $ 200 |  | $ 630 | $ 272
[1] | Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

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- 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 + Details
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