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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Table Text Block] | This unaudited quarterly information has been prepared on the same basis as our annual audited financial statements and includes all adjustments, consisting only of normal recurring adjustments that are necessary to present fairly the financial information for the fiscal quarters presented.
2019: |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Revenue |  | $ | 51,775 |  |  | $ | 67,941 |  |  | $ | 65,690 |  |  | $ | 47,667 |
Cost of goods sold |  | 40,605 |  |  | 43,068 |  |  | 38,555 |  |  | 29,793 |
Operating expenses |  | 5,219 |  |  | 5,668 |  |  | 12,687 |  |  | 13,995 |
Net income |  | 4,033 |  |  | 14,276 |  |  | 10,926 |  |  | 2,388 |
Earnings per share, basic |  | 0.10 |  |  | 0.36 |  |  | 0.27 |  |  | 0.06 |
Earnings per share, diluted |  | 0.10 |  |  | 0.36 |  |  | 0.27 |  |  | 0.05 |
2018: |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Revenue |  | $ | 42,628 |  |  | $ | 54,448 |  |  | $ | 63,146 |  |  | $ | 52,248 |
Cost of goods sold |  | 35,413 |  |  | 34,678 |  |  | 40,595 |  |  | 34,217 |
Operating expenses |  | 5,862 |  |  | 6,861 |  |  | 5,145 |  |  | 23,820 |
Net income |  | 975 |  |  | 10,021 |  |  | 12,125 |  |  | (4,433) |
Earnings per share, basic |  | 0.02 |  |  | 0.25 |  |  | 0.30 |  |  | (0.11) |
Earnings per share, diluted |  | 0.02 |  |  | 0.25 |  |  | 0.30 |  |  | (0.11) |

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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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