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Summary of Unaudited Quarterly Results of Operations Summary of Unaudited Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Summary of unaudited quarterly results | Unaudited quarterly results of operations for the years ended December 31, 2016 and 2015 are summarized below:
| (Dollars in thousands, except per share data)
| 2016 Quarter Ended
| Dec. 31 |  | Sep. 30 |  | Jun. 30 |  | Mar. 31
Net sales | $ | 67,315 |  |  | $ | 70,199 |  |  | $ | 69,348 |  |  | $ | 69,711 |
Gross profit | $ | 40,504 |  |  | $ | 42,573 |  |  | $ | 42,526 |  |  | $ | 42,459 |
Net income (loss) | $ | (4,643 | ) |  | $ | 1,825 |  |  | $ | 172 |  |  | $ | 1,017 |
Basic income (loss) per share of common stock (1) | $ | (0.53 | ) |  | $ | 0.21 |  |  | $ | 0.02 |  |  | $ | 0.12 |
Diluted income (loss) per share of common stock (1) | $ | (0.53 | ) |  | $ | 0.20 |  |  | $ | 0.02 |  |  | $ | 0.11 |
| (Dollars in thousands, except per share data)
| 2015 Quarter Ended
| Dec. 31 |  | Sep. 30 |  | Jun. 30 |  | Mar. 31
Net sales | $ | 64,961 |  |  | $ | 70,243 |  |  | $ | 70,726 |  |  | $ | 69,904 |
Gross profit | $ | 39,091 |  |  | $ | 43,342 |  |  | $ | 43,808 |  |  | $ | 42,883 |
Net income (loss) | $ | (3,688 | ) |  | $ | 2,430 |  |  | $ | 2,926 |  |  | $ | (1,371 | )
Basic income (loss) per share of common stock (1) | $ | (0.42 | ) |  | $ | 0.28 |  |  | $ | 0.34 |  |  | $ | (0.16 | )
Diluted income (loss) per share of common stock (1) | $ | (0.42 | ) |  | $ | 0.27 |  |  | $ | 0.33 |  |  | $ | (0.16 | )
(1) | The sum of the quarterly earnings per share amounts may not equal the total annual earnings per share due to rounding and the uneven timing of earnings throughout the year compared to the weighted average shares outstanding.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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