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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information |
| Year Ended December 31, 2019 |  |  |  |  |  |
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Sales | $ | 92,463 |  |  | $ | 90,685 |  |  | $ | 90,501 |  |  | $ | 89,096 |
Cost of sales | 70,903 |  |  | 71,895 |  |  | 70,979 |  |  | 72,436 |
Gross profit | 21,560 |  |  | 18,790 |  |  | 19,522 |  |  | 16,660 |
SG&A expenses | 5,309 |  |  | 7,186 |  |  | 8,648 |  |  | 8,147 |
Operating income | 16,251 |  |  | 11,604 |  |  | 10,874 |  |  | 8,513 |
Interest expense, net | (368) |  |  | (364) |  |  | (321) |  |  | (252) |
Income before income taxes | 15,883 |  |  | 11,240 |  |  | 10,553 |  |  | 8,261 |
Income tax expense | 2,936 |  |  | 3,025 |  |  | 2,642 |  |  | (1,459) |
Net income | $ | 12,947 |  |  | $ | 8,215 |  |  | $ | 7,911 |  |  | $ | 9,720 |
Basic and diluted EPS data(a) | $ | 0.76 |  |  | $ | 0.48 |  |  | $ | 0.46 |  |  | $ | 0.57 |
| Year Ended December 31, 2018 |  |  |  |  |  |
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Sales | $ | 104,850 |  |  | $ | 95,031 |  |  | $ | 88,252 |  |  | $ | 87,956 |
Cost of sales | 79,242 |  |  | 75,432 |  |  | 68,811 |  |  | 69,005 |
Gross profit | 25,608 |  |  | 19,599 |  |  | 19,441 |  |  | 18,951 |
SG&A expenses | 8,996 |  |  | 7,584 |  |  | 8,309 |  |  | 8,562 |
Operating income | 16,612 |  |  | 12,015 |  |  | 11,132 |  |  | 10,389 |
Interest expense, net | (338) |  |  | (334) |  |  | (289) |  |  | (207) |
Income before income taxes | 16,274 |  |  | 11,681 |  |  | 10,843 |  |  | 10,182 |
Income tax expense (benefit) | 4,452 |  |  | 2,673 |  |  | 3,316 |  |  | 1,255 |
Net income | $ | 11,822 |  |  | $ | 9,008 |  |  | $ | 7,527 |  |  | $ | 8,927 |
Basic and diluted EPS data(a) | $ | 0.69 |  |  | $ | 0.52 |  |  | $ | 0.44 |  |  | $ | 0.52 |
(a)Quarterly EPS amounts may not add to amounts for the year because quarterly and annual EPS calculations are performed separately.

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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=118952077&loc=d3e1280-108306 + Details
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