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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations |
|  | Quarter ended |
|  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
|  | (In millions, except per share amounts) |
2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 29.9 |  |  | $ | 30.0 |  |  | $ | 27.0 |  |  | $ | 25.1 |
Gross profit |  |  | 9.7 |  |  |  | 9.5 |  |  |  | 8.2 |  |  |  | 7.4 |
Operating income |  |  | 4.5 |  |  |  | 4.6 |  |  |  | 3.4 |  |  |  | 2.7 |
Net income |  |  | 3.2 |  |  |  | 3.3 |  |  |  | 2.5 |  |  |  | 4.3 |
Basic and diluted earnings per share |  | $ | .25 |  |  | $ | .27 |  |  | $ | .20 |  |  | $ | .34 |
2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 28.4 |  |  | $ | 32.4 |  |  | $ | 30.0 |  |  | $ | 27.4 |
Gross profit |  |  | 9.5 |  |  |  | 11.2 |  |  |  | 9.6 |  |  |  | 7.9 |
Operating income |  |  | 4.4 |  |  |  | 6.0 |  |  |  | 4.5 |  |  |  | 2.9 |
Net income |  |  | 3.7 |  |  |  | 5.0 |  |  |  | 3.9 |  |  |  | 2.7 |
Basic and diluted earnings per share |  | $ | .30 |  |  | $ | .40 |  |  | $ | .32 |  |  | $ | .22 |

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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=109225645&loc=d3e1280-108306 + Details
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