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Note 1 - Summary of Significant Interim Accounting Policies - Adjustments to Retained Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Net sales | $ 95,870 | $ 67,773 | $ 251,349 | $ 194,365 |
Cost of goods sold | 62,070 | 42,984 | 163,396 | 123,987 |
Selling and administrative expenses | 25,482 | 17,386 | 69,991 | 51,809 |
Income before taxes on income | 7,282 | 6,842 | 15,699 | 17,948 |
Income tax expense | 1,160 | $ 1,880 | 3,310 | $ 4,810 |
Adjustment to opening retained earnings | 102,062 |  | 102,062 |  | $ 83,129
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Net sales |  |  | 42,880 |  |
Cost of goods sold |  |  | 27,397 |  |
Selling and administrative expenses |  |  | 706 |  |
Income before taxes on income |  |  | 14,777 |  |
Income tax expense |  |  | 3,542 |  |
Adjustment to opening retained earnings | $ 11,235 |  | $ 11,235 |  |

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