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Note 8 - Stockholders' Equity (Details) - Share Repurchases (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 29 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Common Class A [Member] Share Repurchase Plan [Member] | Dec. 31, 2012 Common Class A [Member] Share Repurchase Plan [Member] | Dec. 31, 2011 Common Class A [Member] Share Repurchase Plan [Member] | Dec. 31, 2013 Common Class A [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased (1) |  |  | 419,376 | 127,900 | [1] | 848,092 | [1] | 716,431 | [1] | 1,273,047
Total purchase price (in thousands) (in Dollars) | $ 7,903 | $ 23,279 | $ 13,568 | $ 5,213 |  | $ 20,698 |  | $ 12,389 |  |
Average purchase price per share (in Dollars per share) |  |  |  | $ 40.76 |  | $ 24.41 |  | $ 17.29 |  | $ 24.18
[1] | Includes only shares repurchased under repurchase plans. An additional 59,721, 80,687 and 56,012 shares were repurchased in association with tax withholdings on the exercise of stock options in 2013, 2012 and 2011, respectively.

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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 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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