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Quarterly Data | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Data (Unaudited) [Text Block] | 21. Quarterly Data (Unaudited)
|  |  |  |  | Continuing Operations |  |  |  |  |  | Net Earnings |  |  |  |  |  |  |  |  |
Quarter | Revenue |  | Gross Profit |  | Earnings |  | Per Share - Basic |  | Per Share - Diluted |  | Net Earnings | Per Share - Basic |  | Per Share - Diluted |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First | $ | 1,637,671 |  | $ | 602,828 |  | $ | 109,409 |  | $ | 0.71 |  | $ | 0.70 |  | $ | 131,434 | $ | 0.85 |  | $ | 0.84 |  |  |  |  |  |
Second | 1,798,094 |  | 665,236 |  | 166,456 |  | 1.10 |  | 1.08 |  | 139,959 | 0.92 |  | 0.91 |  |  |  |  |  |
Third | 1,747,403 |  | 646,520 |  | 157,305 |  | 1.07 |  | 1.05 |  | 157,305 | 1.07 |  | 1.05 |  |  |  |  |  |
Fourth | 1,808,950 |  | 644,972 |  | 157,975 |  | 1.08 |  | 1.07 |  | 141,569 | 0.97 |  | 0.96 |  |  |  |  |  |
| $ | 6,992,118 |  | $ | 2,559,556 |  | $ | 591,145 |  | $ | 3.94 |  | $ | 3.89 |  | $ | 570,267 | $ | 3.80 |  | $ | 3.75 |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First | $ | 1,583,210 |  | $ | 575,853 |  | $ | 155,088 |  | $ | 1.00 |  | $ | 0.99 |  | $ | 172,247 | $ | 1.11 |  | $ | 1.09 |  |  |  |  |  |
Second | 1,737,371 |  | 654,108 |  | 142,475 |  | 0.92 |  | 0.90 |  | 164,058 | 1.05 |  | 1.04 |  |  |  |  |  |
Third | 1,747,775 |  | 649,193 |  | 159,455 |  | 1.02 |  | 1.01 |  | 178,912 | 1.15 |  | 1.14 |  |  |  |  |  |
Fourth | 1,752,530 |  | 649,893 |  | 289,645 |  | 1.86 |  | 1.83 |  | 296,448 | 1.90 |  | 1.88 |  |  |  |  |  |
| $ | 6,820,886 |  | $ | 2,529,047 |  | $ | 746,663 |  | $ | 4.80 |  | $ | 4.73 |  | $ | 811,665 | $ | 5.21 |  | $ | 5.15 |  |  |  |  |  |

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- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration