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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net income | $ 709 | $ 2,821 | $ 3,193 | $ 2,355 | $ 695 | $ 4,278 | $ 3,125 | $ 2,976 | $ 9,078 | $ 11,074 | $ 13,860
Effect on cost of goods sold |  |  |  |  |  |  |  |  | 172,889 | 163,662 | 176,256
Revenues | 55,343 | 61,040 | 65,835 | 63,675 | 50,841 | 61,534 | 60,479 | 59,580 | 245,893 | 232,434 | 249,682
Gross margin | $ 16,728 | $ 17,907 | $ 19,864 | $ 18,505 | $ 14,346 | $ 18,939 | $ 17,987 | $ 17,500 | $ 73,004 | $ 68,772 | $ 73,426
Basic earnings per share (in dollars per share) | $ 0.08 | $ 0.30 | $ 0.34 | $ 0.25 | $ 0.08 | $ 0.46 | $ 0.34 | $ 0.32 | $ 1.01 | $ 1.20 | $ 1.52
Diluted earnings per share (in dollars per share) | $ 0.08 | $ 0.30 | $ 0.34 | $ 0.25 | $ 0.07 | $ 0.46 | $ 0.34 | $ 0.32 | $ 1.00 | $ 1.20 | $ 1.51
Scenario previously reported |  |  |  |  |  |  |  |  |  |  |
Net income | $ 1,489 | $ 2,520 | $ 2,942 | $ 2,127 |  |  |  |  |  |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Effect on cost of goods sold | $ 780 | $ (301) | $ (251) | $ (228) |  |  |  |  |  |  |

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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