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Note 1 - Summary of Significant Accounting Policies - Impact of New Standard on Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Net sales | $ 86,552 | $ 73,087
Cost of goods sold | 56,284 | 48,212
Selling and administrative expenses | 25,863 | 21,182
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |
Net sales | 88,346 |
Cost of goods sold | 57,117 |
Selling and administrative expenses | 25,822 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |
Net sales | (1,794) | $ 3,800
Cost of goods sold | (833) |
Selling and administrative expenses | $ 41 |

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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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