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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information |
| Year Ended December 31, 2018
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Net 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 (Note 6) | 4,452 |  |  | 2,673 |  |  | 3,316 |  |  | 1,255 |
Net income | $ | 11,822 |  |  | $ | 9,008 |  |  | $ | 7,527 |  |  | $ | 8,927 |
Basic and diluted EPS data | $ | 0.69 |  |  | $ | 0.52 |  |  | $ | 0.44 |  |  | $ | 0.52 |
Dividends and dividend equivalents per common share and per unit | $ | 0.08 |  |  | $ | 0.08 |  |  | $ | 0.08 |  |  | $ | 0.08 |
| Year Ended December 31, 2017
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Net sales | $ | 88,193 |  |  | $ | 86,333 |  |  | $ | 85,753 |  |  | $ | 87,169 |
Cost of sales | 68,668 |  |  | 67,708 |  |  | 66,928 |  |  | 68,128 |
Gross profit | 19,525 |  |  | 18,625 |  |  | 18,825 |  |  | 19,041 |
SG&A expenses | 8,993 |  |  | 8,154 |  |  | 8,311 |  |  | 7,649 |
Operating income | 10,532 |  |  | 10,471 |  |  | 10,514 |  |  | 11,392 |
Gain on sale of equity method investment (Note 4)(a) | — |  |  | 11,381 |  |  | — |  |  | — |
Equity method investment earnings (loss) (Note 4) | — |  |  | — |  |  | (819 | ) |  | 471 |
Interest expense, net | (250 | ) |  | (224 | ) |  | (379 | ) |  | (331 | )
Income before income taxes | 10,282 |  |  | 21,628 |  |  | 9,316 |  |  | 11,532 |
Income tax expense (benefit) (Note 6)(b) | (2,357 | ) |  | 7,491 |  |  | 2,947 |  |  | 2,854 |
Net income | $ | 12,639 |  |  | $ | 14,137 |  |  | $ | 6,369 |  |  | $ | 8,678 |
Basic and diluted EPS data(c) | $ | 0.74 |  |  | $ | 0.82 |  |  | $ | 0.37 |  |  | $ | 0.50 |
Dividends and dividend equivalents per common share and per unit | $ | 0.04 |  |  | $ | 0.89 |  |  | $ | 0.04 |  |  | $ | 0.04 |
(a) | Net income was positively impacted during the third quarter of 2017 by a gain on sale of equity method investment of $11,381 related to the sale of the Company's equity ownership interest in ICP to Pacific Ethanol on July 3, 2017 (Note 4).
(b) | Net income was positively impacted during the fourth quarter of 2017 by a provisional income tax benefit of $3,343 related to the Tax Act enacted on December 22, 2017 (Note 6).
(c) | 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=109225645&loc=d3e1280-108306 + Details
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