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Note 1 - Summary of Significant Interim Accounting Policies - Adjustments to Retained Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Net sales | $ 82,392 | $ 65,604 | $ 155,479 | $ 126,591 |
Cost of goods sold | 53,114 | 42,230 | 101,326 | 81,003 |
Selling and administrative expenses | 23,327 | 16,994 | 44,509 | 34,423 |
Income before taxes on income | 5,097 | 5,701 | 8,417 | 11,106 |
Income tax expense | 1,280 | $ 1,360 | 2,150 | $ 2,930 |
Adjustment to opening retained earnings | 97,664 |  | 97,664 |  | $ 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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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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