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Note 8 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 20, 2012 shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 shares | Dec. 31, 2014 shares | Feb. 29, 2016 shares | Aug. 31, 2011 shares
Shares Paid for Tax Withholding for Share Based Compensation |  | 94,826 | 77,649 | 106,772 |  |
Common Class A [Member] |  |  |  |  |  |
Conversion of Common Stock Shares |  | 1 |  |  |  |
Common Stock Number of Votes |  | 1 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 250,000,000 | 2,000,000
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased | 1,000,000 |  |  |  |  |
Common Class A [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation |  | 94,826 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  | $ 90.46 |  |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation | $ |  | $ 8.6 |  |  |  |
Common Class A [Member] | The 2016 Stock Repurchase Authorization [Member] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  | $ 193.1 |  |  |  |
Common Class B [Member] |  |  |  |  |  |
Percentage of Class B Common to Total Common Stock Subject to Automatic Conversion |  | 1.00% |  |  |  |
Common Stock Number of Votes |  | 10 |  |  |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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