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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Information |
|  | Revenues |  |  | Gross Profit |  |  | Net Income |  |  | Earnings Per Share |
Year Ended December 31, 2020 |  | Basic |  |  | Diluted |
First quarter |  | $ | 50,425 |  |  | $ | 12,719 |  |  | $ | 1,869 |  |  | $ | .17 |  |  | $ | .16 |
Second quarter |  |  | 47,583 |  |  |  | 12,656 |  |  |  | 2,969 |  |  |  | .26 |  |  |  | .25 |
Third quarter |  |  | 47,383 |  |  |  | 13,090 |  |  |  | 2,998 |  |  |  | .26 |  |  |  | .25 |
Fourth quarter |  |  | 48,710 |  |  |  | 13,074 |  |  |  | 2,025 |  |  |  | .18 |  |  |  | .17 |
Annual |  | $ | 194,101 |  |  | $ | 51,539 |  |  | $ | 9,861 |  |  | $ | .87 |  |  | $ | .83 |
|  | Revenues |  |  | Gross Profit |  |  | Net Income |  |  | Earnings Per Share |
Year Ended December 31, 2019 |  | Basic |  |  | Diluted |
First quarter |  | $ | 45,199 |  |  | $ | 10,835 |  |  | $ | 964 |  |  | $ | .09 |  |  | $ | .09 |
Second quarter |  |  | 48,472 |  |  |  | 12,054 |  |  |  | 5,958 |  |  |  | .54 |  |  |  | .53 |
Third quarter |  |  | 49,543 |  |  |  | 12,329 |  |  |  | 1,949 |  |  |  | .18 |  |  |  | .17 |
Fourth quarter |  |  | 50,360 |  |  |  | 12,763 |  |  |  | 2,274 |  |  |  | .21 |  |  |  | .20 |
Annual |  | $ | 193,574 |  |  | $ | 47,981 |  |  | $ | 11,145 |  |  | $ | 1.01 |  |  | $ | .99 |

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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=121640914&loc=d3e1280-108306 + Details
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