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Note 12 - Net Income Per Share of Class A and Class B Common Stock (Details) - Earnings Per Share Reconciliation (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Income from continuing operations applicable to common stockholders $ 35,170 $ 25,281 $ 59,864 $ 47,163
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 26,119 25,782 26,047 25,730
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 26,331 26,134 26,326 26,120
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.34 $ 0.97 $ 2.27 $ 1.81
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.35 $ 0.98 $ 2.30 $ 1.83
Common Class A [Member] | Equity Option [Member]
        
Antidilutive Securities        
Shares issuable pursuant to stock options not included since they were antidilutive (in Shares) 12 18 14 19
Common Class A [Member] | Basic [Member]
        
Numerator:        
Distributed income applicable to common stockholders (3,769) (3,018) (6,814) (3,007)
Numerator:        
Distributed income applicable to common stockholders 3,769 3,018 6,814 3,007
Common Class A [Member] | Distributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options 3 5 8 5
Reallocation of income due to conversion of Class B to Class A 407 333 735 344
Common Class A [Member] | Diluted [Member]
        
Numerator:        
Distributed income applicable to common stockholders (4,179) (3,356) (7,557) (3,356)
Numerator:        
Distributed income applicable to common stockholders 4,179 3,356 7,557 3,356
Common Class A [Member] | Undistributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options 25 30 55 69
Reallocation of income due to conversion of Class B to Class A 3,015 2,179 5,090 4,491
Common Class A [Member]
        
Numerator:        
Income from continuing operations applicable to common stockholders 31,720 22,734 53,976 42,254
Undistributed income from continuing operations applicable to common stockholders 27,951 19,716 47,162 39,247
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 23,557 23,185 23,485 23,052
Weighted average number of shares from stock options (in Shares) 212 352 279 390
Conversion of Class B to Class A common shares outstanding (in Shares) 2,562 2,597 2,562 2,678
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 26,331 26,134 26,326 26,120
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.34 $ 0.97 $ 2.27 $ 1.81
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.16) $ (0.13) $ (0.29) $ (0.13)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.18 $ 0.84 $ 1.98 $ 1.68
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.35 $ 0.98 $ 2.30 $ 1.83
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.16) $ (0.13) $ (0.29) $ (0.13)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.19 $ 0.85 $ 2.01 $ 1.70
Numerator:        
Diluted undistributed income from continuing operations applicable to common stockholders 30,991 21,925 52,307 43,807
Common Class B [Member] | Basic [Member]
        
Numerator:        
Distributed income applicable to common stockholders (410) (338) (743) (349)
Numerator:        
Distributed income applicable to common stockholders 410 338 743 349
Common Class B [Member] | Distributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options (3) (5) (8) (5)
Common Class B [Member] | Diluted [Member]
        
Numerator:        
Distributed income applicable to common stockholders (407) (333) (735) (344)
Numerator:        
Distributed income applicable to common stockholders 407 333 735 344
Common Class B [Member] | Undistributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options (25) (30) (55) (69)
Common Class B [Member]
        
Numerator:        
Income from continuing operations applicable to common stockholders 3,450 2,547 5,888 4,909
Undistributed income from continuing operations applicable to common stockholders 3,040 2,209 5,145 4,560
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 2,562 2,597 2,562 2,678
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 2,562 2,597 2,562 2,678
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.34 $ 0.97 $ 2.27 $ 1.81
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.16) $ (0.13) $ (0.29) $ (0.13)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.18 $ 0.84 $ 1.98 $ 1.68
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.35 $ 0.98 $ 2.30 $ 1.83
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.16) $ (0.13) $ (0.29) $ (0.13)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.19 $ 0.85 $ 2.01 $ 1.70
Numerator:        
Diluted undistributed income from continuing operations applicable to common stockholders $ 3,015 $ 2,179 $ 5,090 $ 4,491