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Note 4 - Income Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Domestic |  |  |  |  |  | $ 1 | $ (12,797) |  |
Foreign | 80 | (3,959) |  |  |  | 4,250 | 17,491 |  |
Total current income tax provision (benefit) | 80 | (3,959) |  |  |  | 4,251 | 4,694 |  |
Domestic | (3,778) | 1,980 |  |  |  | (3,778) | (13,958) |  |
Foreign | 1,019 | (3,151) |  |  |  | (1,957) | (8,300) |  |
Total deferred income tax provision (benefit) | (2,759) | (1,171) |  |  |  | (5,735) | (22,258) |  |
Total income tax provision (benefit) | $ (2,679) | $ (5,130) | $ 16,366 | $ (28,800) | $ (12,434) | $ (1,484) | $ (17,564) | $ 20,963 | $ 28,090

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