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Note 15 - Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Quarterly Financial Information [Table Text Block] |
|  | Quarter |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 2,089,627 |  |  | $ | 2,261,647 |  |  | $ | 2,363,660 |  |  | $ | 2,450,323 |
Operating income |  | $ | 167,795 |  |  | $ | 193,093 |  |  | $ | 167,862 |  |  | $ | 205,074 |
Net earnings |  | $ | 119,601 |  |  | $ | 133,633 |  |  | $ | 118,410 |  |  | $ | 144,676 |
Basic earnings per share |  | $ | 1.10 |  |  | $ | 1.24 |  |  | $ | 1.11 |  |  | $ | 1.36 |
Diluted earnings per share |  | $ | 1.09 |  |  | $ | 1.23 |  |  | $ | 1.10 |  |  | $ | 1.35 |
2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 1,948,245 |  |  | $ | 2,139,027 |  |  | $ | 2,209,760 |  |  | $ | 2,317,842 |
Operating income |  | $ | 168,781 |  |  | $ | 214,812 |  |  | $ | 174,688 |  |  | $ | 122,740 |
Net earnings |  | $ | 118,142 |  |  | $ | 151,652 |  |  | $ | 131,110 |  |  | $ | 88,681 |
Basic earnings per share |  | $ | 1.08 |  |  | $ | 1.39 |  |  | $ | 1.20 |  |  | $ | 0.81 |
Diluted earnings per share |  | $ | 1.07 |  |  | $ | 1.37 |  |  | $ | 1.19 |  |  | $ | 0.81 |

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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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