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Note 7 - Net Income Per Share of Class A and Class B Common Stock - Earnings Per Share Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Shares used in basic per share calculations (in shares) 25,180 25,816
Shares used in diluted per share calculations (in shares) 25,250 25,973
Basic net income per share (in dollars per share) $ 2.01 $ 1.56
Diluted net income per share (in dollars per share) $ 2.01 $ 1.55
Common Class A [Member]    
Net income applicable to common stockholders - basic $ 47,826 $ 36,692
Reallocation of net income as a result of conversion of dilutive stock options 1 3
Reallocation of net income due to conversion of Class B to Class A common shares outstanding 359 455
Conversion of Class B common shares into Class A common shares 2,534 3,102
Effect of dilutive stock options on net income 7 18
Net income applicable to common stockholders - diluted $ 50,727 $ 40,270
Shares used in basic per share calculations (in shares) 23,740 23,522
Conversion of Class B common shares into Class A common shares (in shares) 1,440 2,294
Effect of dilutive stock options on weighted average common shares (in shares) 70 157
Shares used in diluted per share calculations (in shares) 25,250 25,973
Basic net income per share (in dollars per share) $ 2.01 $ 1.56
Diluted net income per share (in dollars per share) $ 2.01 $ 1.55
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) 20
Common Class B [Member]    
Net income applicable to common stockholders - basic $ 2,901 $ 3,578
Reallocation of net income as a result of conversion of dilutive stock options (1) (3)
Reallocation of net income due to conversion of Class B to Class A common shares outstanding
Conversion of Class B common shares into Class A common shares
Effect of dilutive stock options on net income (7) (18)
Net income applicable to common stockholders - diluted $ 2,893 $ 3,557
Shares used in basic per share calculations (in shares) 1,440 2,294
Conversion of Class B common shares into Class A common shares (in shares)
Effect of dilutive stock options on weighted average common shares (in shares)
Shares used in diluted per share calculations (in shares) 1,440 2,294
Basic net income per share (in dollars per share) $ 2.01 $ 1.56
Diluted net income per share (in dollars per share) $ 2.01 $ 1.55
Shares issuable pursuant to stock options not included since they were antidilutive (in shares)