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Note 12 - Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 1 2 . Selected Quarterly Financial Data (Unaudited)
|  | Fiscal Quarter |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
|  | (In thousands, except for per share data) |
Year Ended December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue (less agency commissions) |  | $ | 173,723 |  |  | $ | 196,633 |  |  | $ | 204,490 |  |  | $ | 237,619 |
Operating income |  |  | 36,111 |  |  |  | 53,687 |  |  |  | 60,467 |  |  |  | 83,874 |
Net income |  |  | 8,990 |  |  |  | 17,662 |  |  |  | (213 | ) |  |  | 35,834 |
Basic net income per share |  | $ | 0.13 |  |  | $ | 0.25 |  |  | $ | - |  |  | $ | 0.50 |
Diluted net income per share |  | $ | 0.12 |  |  | $ | 0.24 |  |  | $ | - |  |  | $ | 0.49 |
Year Ended December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue (less agency commissions) |  | $ | 133,303 |  |  | $ | 143,464 |  |  | $ | 151,102 |  |  | $ | 169,487 |
Operating income |  |  | 28,058 |  |  |  | 38,758 |  |  |  | 29,344 |  |  |  | 43,897 |
Net income |  |  | 5,595 |  |  |  | 12,110 |  |  |  | 6,609 |  |  |  | 14,987 |
Basic net income per share |  | $ | 0.10 |  |  | $ | 0.17 |  |  | $ | 0.09 |  |  | $ | 0.21 |
Diluted net income per share |  | $ | 0.10 |  |  | $ | 0.17 |  |  | $ | 0.09 |  |  | $ | 0.21 |
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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