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Note 15 - Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 1 5. Selected Quarterly Financial Data (Unaudited) The following table summarizes our unaudited results of operations on a quarterly basis. The quarterly earnings per share amounts for a year will not necessarily add to the earnings per share for that year due to the weighting of shares used in calculating per share data.
|  | Fiscal Quarter |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
|  | (In millions, except for per share data) |
Year Ended December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue (less agency commissions) |  | $ | 534 |  |  | $ | 451 |  |  | $ | 604 |  |  | $ | 792 |
Operating income |  |  | 124 |  |  |  | 65 |  |  |  | 212 |  |  |  | 351 |
Net income (loss) attributable to common stockholders |  |  | 40 |  |  |  | (2 | ) |  |  | 109 |  |  |  | 211 |
Basic net income (loss) attributable to common stockholders per share |  | $ | 0.41 |  |  | $ | (0.02 | ) |  | $ | 1.15 |  |  | $ | 2.24 |
Diluted net income (loss) attributable to common stockholders per share |  | $ | 0.40 |  |  | $ | (0.02 | ) |  | $ | 1.14 |  |  | $ | 2.22 |
Year Ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue (less agency commissions) |  | $ | 518 |  |  | $ | 508 |  |  | $ | 517 |  |  | $ | 579 |
Operating income |  |  | 40 |  |  |  | 119 |  |  |  | 139 |  |  |  | 180 |
Net (loss) income attributable to common stockholders |  |  | (31 | ) |  |  | 31 |  |  |  | 46 |  |  |  | 81 |
Basic net (loss) income attributable to common stockholders per share |  | $ | (0.31 | ) |  | $ | 0.31 |  |  | $ | 0.46 |  |  | $ | 0.82 |
Diluted net (loss) income attributable to common stockholders per share |  | $ | (0.31 | ) |  | $ | 0.31 |  |  | $ | 0.46 |  |  | $ | 0.81 |
Because of the method used in calculating per share data, the sum of the quarterly per share data will not necessarily equal the per share data as computed for the year.

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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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