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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) Summarized quarterly financial data is as follows:
| 2020
(In thousands, except per share amounts) | March 31, |  | June 30, |  | September 30, |  | December 31,
Net sales | $ | 151,778 |  |  | $ | 153,133 |  |  | $ | 153,505 |  |  | $ | 156,264 |
Gross profit | 42,941 |  |  | 38,075 |  |  | 44,156 |  |  | 51,084 |
Operating income | 8,046 |  |  | 6,460 |  |  | 10,246 |  |  | 12,515 |
Net income | 5,846 |  |  | 14,400 |  |  | 6,168 |  |  | 12,158 |
Earnings per share (1): |  |  |  |  |  |  |
Basic | $ | 0.42 |  |  | $ | 1.03 |  |  | $ | 0.44 |  |  | $ | 0.88 |
Diluted | $ | 0.41 |  |  | $ | 1.02 |  |  | $ | 0.43 |  |  | $ | 0.86 |
| 2019
(In thousands, except per share amounts) | March 31, |  | June 30, |  | September 30, |  | December 31,
Net sales | $ | 184,163 |  |  | $ | 193,896 |  |  | $ | 200,724 |  |  | $ | 174,694 |
Gross profit | 39,874 |  |  | 33,993 |  |  | 46,479 |  |  | 49,857 |
Operating income (loss) | 1,663 |  |  | (3,926) |  |  | 6,127 |  |  | 11,451 |
Net income (loss) | (1,005) |  |  | (5,061) |  |  | 2,669 |  |  | 7,027 |
Earnings (loss) per share (1): |  |  |  |  |  |  |
Basic | $ | (0.07) |  |  | $ | (0.37) |  |  | $ | 0.19 |  |  | $ | 0.50 |
Diluted | $ | (0.07) |  |  | $ | (0.37) |  |  | $ | 0.19 |  |  | $ | 0.49 |
(1)The earnings per common share calculations for each of the quarters were based upon the weighted average number of shares and share equivalents outstanding during each period, and the sum of the quarters may not be equal to the full year earnings per share amounts.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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