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Note 1 - Summary of Significant Interim Accounting Policies - Impact of New Standard on Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 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
Accounting Standards Update 2014-09 [Member] |  |  |  |
Net sales |  |  | 42,880 |
Cost of goods sold |  |  | 27,397 |
Selling and administrative expenses |  |  | 706 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Net sales | 92,945 |  | 247,634 |
Cost of goods sold | 59,908 |  | 160,551 |
Selling and administrative expenses | 25,527 |  | 70,058 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Net sales | 2,925 |  | 3,715 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
Net sales | 2,925 |  | 3,715 |
Cost of goods sold | 2,162 |  | 2,845 |
Selling and administrative expenses | $ (45) |  | $ (67) |

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