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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Income from continuing operations applicable to common stockholders $ 25,281 $ 20,005 $ 47,163 $ 36,639
Denominator:        
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 25,782 25,730 25,730 25,860
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 26,134 26,185 26,120 26,331
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.97 $ 0.76 $ 1.81 $ 1.39
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.98 $ 0.78 $ 1.83 $ 1.42
Equity Option [Member] | Common Class A [Member]
        
Antidilutive Securities        
Shares issuable pursuant to stock options not included since they were antidilutive (in Shares) 18 45 19 90
Common Class A [Member] | Basic [Member]
        
Numerator:        
Distributed income applicable to common stockholders (3,018) (2,230) (3,007) (3,779)
Numerator:        
Distributed income applicable to common stockholders 3,018 2,230 3,007 3,779
Common Class A [Member] | Distributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options 5 6 5 11
Reallocation of income due to conversion of Class B to Class A 333 348 344 608
Common Class A [Member] | Diluted [Member]
        
Numerator:        
Distributed income applicable to common stockholders (3,356) (2,584) (3,356) (4,398)
Numerator:        
Distributed income applicable to common stockholders 3,356 2,584 3,356 4,398
Common Class A [Member] | Undistributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options 30 42 69 81
Reallocation of income due to conversion of Class B to Class A 2,179 2,348 4,491 4,456
Common Class A [Member]
        
Numerator:        
Income from continuing operations applicable to common stockholders 22,734 17,261 42,254 31,483
Undistributed income from continuing operations applicable to common stockholders 19,716 15,031 39,247 27,704
Denominator:        
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 23,185 22,201 23,052 22,221
Weighted average number of shares from stock options (in Shares) 352 455 390 471
Conversion of Class B to Class A common shares outstanding (in Shares) 2,597 3,529 2,678 3,639
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 26,134 26,185 26,120 26,331
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.97 $ 0.76 $ 1.81 $ 1.39
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.13) $ (0.10) $ (0.13) $ (0.17)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.84 $ 0.66 $ 1.68 $ 1.22
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.98 $ 0.78 $ 1.83 $ 1.42
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.13) $ (0.10) $ (0.13) $ (0.17)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.85 $ 0.68 $ 1.70 $ 1.25
Numerator:        
Diluted undistributed income from continuing operations applicable to common stockholders 21,925 17,421 43,807 32,241
Common Class B [Member] | Basic [Member]
        
Numerator:        
Distributed income applicable to common stockholders (338) (354) (349) (619)
Numerator:        
Distributed income applicable to common stockholders 338 354 349 619
Common Class B [Member] | Distributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options (5) (6) (5) (11)
Common Class B [Member] | Diluted [Member]
        
Numerator:        
Distributed income applicable to common stockholders (333) (348) (344) (608)
Numerator:        
Distributed income applicable to common stockholders 333 348 344 608
Common Class B [Member] | Undistributed [Member]
        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options (30) (42) (69) (81)
Common Class B [Member]
        
Numerator:        
Income from continuing operations applicable to common stockholders 2,547 2,744 4,909 5,156
Undistributed income from continuing operations applicable to common stockholders 2,209 2,390 4,560 4,537
Denominator:        
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 2,597 3,529 2,678 3,639
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 2,597 3,529 2,678 3,639
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.97 $ 0.76 $ 1.81 $ 1.39
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.13) $ (0.10) $ (0.13) $ (0.17)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.84 $ 0.66 $ 1.68 $ 1.22
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.98 $ 0.78 $ 1.83 $ 1.42
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ (0.13) $ (0.10) $ (0.13) $ (0.17)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 0.85 $ 0.68 $ 1.70 $ 1.25
Numerator:        
Diluted undistributed income from continuing operations applicable to common stockholders $ 2,179 $ 2,348 $ 4,491 $ 4,456