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Note 11 - Business Segment Information - Segment Activity (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
Segment contribution |  | 3,042 | 1,632 | 3,590 | 3,988
Other expense |  | (83) | 86 | (141) | (48)
Tax provision |  | (676) | (78) | (717) | (133)
Non-controlling interest |  | (27) | (13) | (51) | (30)
Net income attributable to Ultralife |  | 2,256 | 1,627 | 2,681 | 3,777
Other income |  | (83) | 86 | (141) | (48)
Other expense |  | (83) | 86 | (141) | (48)
Battery & Energy Products Segment [Member] |  |  |  |  |
Revenues | [1] | 20,300 | 17,831 | 36,298 | 35,055
Segment contribution |  | 5,655 | 4,926 | 10,065 | 9,962
Other expense |  |  |  |  |
Other income |  |  |  |  |
Other expense |  |  |  |  |
Communications Systems Segment [Member] |  |  |  |  |
Revenues | [1] | 9,097 | 5,033 | 11,981 | 10,878
Segment contribution |  | 3,210 | 1,624 | 3,884 | 3,870
Other expense |  |  |  |  |
Other income |  |  |  |  |
Other expense |  |  |  |  |
Corporate Segment [Member] |  |  |  |  |
Revenues |  |  |  |  |
Segment contribution |  | (5,823) | (4,918) | (10,359) | (9,844)
Other expense |  | (83) | 86 | (141) | (48)
Tax provision |  | (676) | (78) | (717) | (133)
Non-controlling interest |  | (27) | (13) | (51) | (30)
Other income |  | (83) | 86 | (141) | (48)
Other expense |  | $ (83) | $ 86 | $ (141) | $ (48)
[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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