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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 02, 2016 | Jun. 30, 2016 | Mar. 01, 2016 | Feb. 29, 2016 | Jul. 20, 2012 | Aug. 31, 2011
Common Class A [Member] | The 2011 Stock Repurchase Authorization [Member] | Additional Shares Authorized [Member] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 1,000,000 |
Common Class A [Member] | The 2011 Stock Repurchase Authorization [Member] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  | 2,000,000
Common Class A [Member] | The 2016 Stock Repurchase Authorization [Member] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 201.1 |  | $ 250.0 |  |
Common Class A [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation |  | 94,363 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 90.48 |  |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  | $ 8.5 |  |  |  |
Conversion from Class B Common Stock to Class A Common Stock [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted | 780,000 |  |  |  |  |
Voting Power Percentage from Conversion of Stock | 42.40% |  | 52.30% |  |  |

X
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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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X
- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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X
- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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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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