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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Revenues | [1] | $ 27,493 | $ 20,330 | $ 75,772 | $ 66,263
Segment contribution |  | 1,306 | 1,500 | 4,896 | 5,488
Other expense |  | (160) | 21 | (301) | (27)
Tax provision |  | (225) | (86) | (942) | (219)
Non-controlling interest |  | (23) | (27) | (74) | (57)
Net income attributable to Ultralife |  | 898 | 1,408 | 3,579 | 5,185
Other income |  | (160) | 21 | (301) | (27)
Other expense |  | (160) | 21 | (301) | (27)
Battery & Energy Products Segment [Member] |  |  |  |  |
Revenues | [1] | 22,578 | 17,289 | 58,876 | 52,344
Segment contribution |  | 6,117 | 4,702 | 16,182 | 14,664
Other expense |  |  |  |  |
Other income |  |  |  |  |
Other expense |  |  |  |  |
Communications Systems Segment [Member] |  |  |  |  |
Revenues | [1] | 4,915 | 3,041 | 16,896 | 13,919
Segment contribution |  | 1,744 | 1,339 | 5,628 | 5,209
Other expense |  |  |  |  |
Other income |  |  |  |  |
Other expense |  |  |  |  |
Corporate Segment [Member] |  |  |  |  |
Revenues |  |  |  |  |
Segment contribution |  | (6,555) | (4,541) | (16,914) | (14,385)
Other expense |  | (160) | 21 | (301) | (27)
Tax provision |  | (225) | (86) | (942) | (219)
Non-controlling interest |  | (23) | (27) | (74) | (57)
Other income |  | (160) | 21 | (301) | (27)
Other expense |  | $ (160) | $ 21 | $ (301) | $ (27)
[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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