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Note 6 - Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended | 35 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 | Jul. 31, 2012
Note 6 - Stockholders' Equity (Details) [Line Items] |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 1,681,953 | 1,681,953 |
Common Class A [Member] | Related to Tax Withholdings [Member] |  |  |
Note 6 - Stockholders' Equity (Details) [Line Items] |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ 65.36 |  |
Common Class A [Member] |  |  |
Note 6 - Stockholders' Equity (Details) [Line Items] |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 3,000,000
Stock Repurchased During Period, Shares | 45,000 | 1,318,047 |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ 71.73 |  |
Stock Repurchased During Period, Value (in Dollars) | $ 3.2 |  |
Shares Paid for Tax Withholding for Share Based Compensation | 106,772 |  |
Adjustments Related to Tax Withholding for Share-based Compensation (in Dollars) | $ 7.0 |  |

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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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- 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 Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + 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 The remaining 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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