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Note 10 - Net Income Per Share of Class A and Class B Common Stock (Details) - Earnings Per Share Reconciliation - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Income from continuing operations applicable to common stockholders $ 51,223 $ 35,170 $ 91,876 $ 59,864
Denominator:        
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 26,332 26,119 26,310 26,047
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 26,496 26,331 26,509 26,326
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.93 $ 1.45 $ 3.47 $ 2.39
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.95 $ 1.35 $ 3.49 $ 2.30
Common Class A [Member]        
Numerator:        
Income from continuing operations applicable to common stockholders $ 46,239 $ 31,720 $ 82,929 $ 53,976
Distributed income applicable to common stockholders (4,754) (3,769) (8,559) (6,814)
Basic undistributed income from continuing operations applicable to common stockholders $ 41,485 $ 27,951 $ 74,370 $ 47,162
Denominator:        
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 23,770 23,557 23,748 23,485
Weighted average number of shares from stock options (in Shares) 164 212 199 279
Conversion of Class B to Class A common shares outstanding (in Shares) 2,562 2,562 2,562 2,562
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 26,496 26,331 26,509 26,326
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.93 $ 1.34 $ 3.47 $ 2.27
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) (0.20) (0.16) (0.36) (0.29)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) 1.73 1.18 3.11 1.98
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) 1.95 1.35 3.49 2.30
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) (0.20) (0.16) (0.36) (0.29)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.75 $ 1.19 $ 3.13 $ 2.01
Numerator:        
Distributed income applicable to common stockholders $ 4,754 $ 3,769 $ 8,559 $ 6,814
Undistributed income from continuing operations applicable to common stockholders $ 41,485 $ 27,951 $ 74,370 $ 47,162
Common Class A [Member] | Employee Stock Option [Member]        
Antidilutive Securities        
Shares issuable pursuant to stock options not included since they were antidilutive (in Shares) 17 12 16 14
Common Class B [Member]        
Numerator:        
Income from continuing operations applicable to common stockholders $ 4,984 $ 3,450 $ 8,947 $ 5,888
Distributed income applicable to common stockholders (512) (410) (923) (743)
Basic undistributed income from continuing operations applicable to common stockholders $ 4,472 $ 3,040 $ 8,024 $ 5,145
Denominator:        
Weighted average number of shares outstanding used to calculate basic income per share (in Shares) 2,562 2,562 2,562 2,562
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares) 2,562 2,562 2,562 2,562
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.93 $ 1.34 $ 3.47 $ 2.27
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) (0.20) (0.16) (0.36) (0.29)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) 1.73 1.18 3.11 1.98
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share) 1.95 1.35 3.49 2.30
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share) (0.20) (0.16) (0.36) (0.29)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share) $ 1.75 $ 1.19 $ 3.13 $ 2.01
Numerator:        
Distributed income applicable to common stockholders $ 512 $ 410 $ 923 $ 743
Undistributed income from continuing operations applicable to common stockholders $ 4,472 $ 3,040 $ 8,024 $ 5,145
Common Class B [Member] | Employee Stock Option [Member]        
Antidilutive Securities        
Shares issuable pursuant to stock options not included since they were antidilutive (in Shares) 0 0 0 0
Distributed [Member] | Common Class A [Member]        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options $ 3 $ 3 $ 7 $ 8
Reallocation of income due to conversion of Class B to Class A 509 407 916 735
Distributed [Member] | Common Class B [Member]        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options (3) (3) (7) (8)
Diluted [Member] | Common Class A [Member]        
Numerator:        
Distributed income applicable to common stockholders (5,266) (4,179) (9,482) (7,557)
Numerator:        
Distributed income applicable to common stockholders 5,266 4,179 9,482 7,557
Undistributed income from continuing operations applicable to common stockholders 45,957 30,991 82,394 52,307
Diluted [Member] | Common Class B [Member]        
Numerator:        
Distributed income applicable to common stockholders (509) (407) (916) (735)
Numerator:        
Distributed income applicable to common stockholders 509 407 916 735
Undistributed income from continuing operations applicable to common stockholders 4,444 3,015 7,963 5,090
Undistributed [Member] | Common Class A [Member]        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options 28 25 61 55
Reallocation of income due to conversion of Class B to Class A 4,444 3,015 7,963 5,090
Undistributed [Member] | Common Class B [Member]        
Numerator:        
Reallocation of income as a result of conversion of dilutive stock options $ (28) $ (25) $ (61) $ (55)