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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
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.