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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The tables below set forth consolidated operating results by fiscal quarter for the years ended December 31, 2018 and 2019 (in thousands, except earnings per share):
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2019 |  |  |  |  |  |  |
Revenue | $ | 69,081 |  |  | $ | 67,752 |  |  | $ | 66,125 |  |  | $ | 71,149 |
Gross profit | 21,600 |  |  | 19,250 |  |  | 18,056 |  |  | 20,679 |
Net income | $ | 6,525 |  |  | $ | 4,862 |  |  | $ | 577 |  |  | $ | 2,569 |
Basic earnings per common share: (a) | $ | 0.36 |  |  | $ | 0.27 |  |  | $ | 0.03 |  |  | $ | 0.14 |
Diluted earnings per common share: (a) | $ | 0.36 |  |  | $ | 0.27 |  |  | $ | 0.03 |  |  | $ | 0.14 |
2018 |  |  |  |  |  |  |
Revenue | $ | 73,387 |  |  | $ | 63,847 |  |  | $ | 64,241 |  |  | $ | 66,517 |
Gross profit | 24,188 |  |  | 16,825 |  |  | 17,114 |  |  | 17,820 |
Net income (loss) | $ | 9,356 |  |  | $ | 2,747 |  |  | $ | 2,200 |  |  | $ | (2,658 | )
Basic earnings per common share: (a) | $ | 0.58 |  |  | $ | 0.15 |  |  | $ | 0.11 |  |  | $ | (0.14 | )
Diluted earnings per common share: (a) | $ | 0.52 |  |  | $ | 0.15 |  |  | $ | 0.11 |  |  | $ | (0.14 | )
(a) | Earnings per share are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the total computed for 2018 and 2019 due to rounding.

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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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