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Quarterly financial summary (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial summary | Unaudited quarterly results for the last two years were as follows (in thousands, except per share data):
| Q1 |  | Q2 |  | Q3 |  | Q4 (1)
2018 |  |  |  |  |  |  |
Net sales | $ | 65,920 |  |  | $ | 59,055 |  |  | $ | 63,889 |  |  | $ | 78,571 |
Gross profit | $ | 40,208 |  |  | $ | 36,645 |  |  | $ | 38,969 |  |  | $ | 46,919 |
Net income | $ | 690 |  |  | $ | 1,248 |  |  | $ | 3,915 |  |  | $ | 9,672 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.01 |  |  | $ | 0.03 |  |  | $ | 0.08 |  |  | $ | 0.20 |
Diluted | $ | 0.01 |  |  | $ | 0.03 |  |  | $ | 0.08 |  |  | $ | 0.20 |
2017 |  |  |  |  |  |  |
Net sales | $ | 60,574 |  |  | $ | 55,856 |  |  | $ | 71,865 |  |  | $ | 81,593 |
Gross profit | $ | 38,228 |  |  | $ | 35,890 |  |  | $ | 42,913 |  |  | $ | 47,694 |
Net income | $ | 2,160 |  |  | $ | 3,970 |  |  | $ | 5,865 |  |  | $ | 21,480 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.05 |  |  | $ | 0.09 |  |  | $ | 0.13 |  |  | $ | 0.47 |
Diluted | $ | 0.04 |  |  | $ | 0.08 |  |  | $ | 0.12 |  |  | $ | 0.44 |
__________________________ (1) Results for the fourth quarter of fiscal 2017 included a tax benefit from the adoption of the 2017 Tax Act, which had a favorable impact of $0.25 and $0.23 on basic and diluted earnings per share, respectively.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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