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Supplementary Data - Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplementary Data - Quarterly Financial Data [Abstract] |
Schedule Of Selected Quarterly Data |
| Year Ended December 31, 2020
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
| (in thousands, except per share amounts)
Net sales | $ | 53,555 |  | $ | 30,014 |  | $ | 64,491 |  | $ | 75,947
Gross profit |  | 18,512 |  |  | 10,636 |  |  | 21,669 |  |  | 26,978
Operating income (loss) |  | 892 |  |  | (4,037) |  |  | 1,555 |  |  | 5,524
Net income (loss) |  | 36 |  |  | (2,743) |  |  | 1,183 |  |  | 7,069
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.00 |  | $ | (0.09) |  | $ | 0.04 |  | $ | 0.23
Diluted |  | 0.00 |  |  | (0.09) |  |  | 0.04 |  |  | 0.22
| Year Ended December 31, 2019
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
| (in thousands, except per share amounts)
Net sales | $ | 61,218 |  | $ | 46,994 |  | $ | 60,203 |  | $ | 61,022
Gross profit |  | 22,056 |  |  | 15,992 |  |  | 20,557 |  |  | 21,686
Operating income (loss) |  | 4,417 |  |  | (1,241) |  |  | 4,077 |  |  | 4,179
Net income (loss) |  | 3,787 |  |  | (694) |  |  | 3,492 |  |  | 12,387
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.13 |  | $ | (0.02) |  | $ | 0.12 |  | $ | 0.42
Diluted |  | 0.12 |  |  | (0.02) |  |  | 0.11 |  |  | 0.40

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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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