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Note 11 - Earnings Per Share Reconciliation (Details) - USD ($)
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Common Class A [Member] | Employee Stock Option [Member]        
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) 18 13 17 13
Common Class A [Member] | Distributed [Member]        
Reallocation of distributed income as a result of conversion of dilutive stock options $ 3,000 $ 3,000 $ 11,000 $ 12,000
Reallocation of distributed income due to conversion of Class B to Class A common shares outstanding 509,000 406,000 1,425,000 1,141,000
Common Class A [Member] | Diluted [Member]        
Distributed income applicable to common stockholders (5,257,000) (4,174,000) (14,739,000) (11,731,000)
Distributed income applicable to common stockholders 5,257,000 4,174,000 14,739,000 11,731,000
Undistributed income from continuing operations applicable to common stockholders 38,134,000 30,363,000 120,528,000 82,670,000
Common Class A [Member] | Undistributed [Member]        
Reallocation of distributed income as a result of conversion of dilutive stock options 27,000 28,000 86,000 82,000
Reallocation of distributed income due to conversion of Class B to Class A common shares outstanding 3,690,000 2,951,000 11,653,000 8,042,000
Common Class A [Member]        
Income from continuing operations, net of income tax 39,162,000 31,149,000 122,092,000 85,124,000
Distributed income applicable to common stockholders (4,745,000) (3,765,000) (13,303,000) (10,578,000)
Basic undistributed income from continuing operations applicable to common stockholders $ 34,417,000 $ 27,384,000 $ 108,789,000 $ 74,546,000
Shares used in basic per share calculations (in shares) 23,727 23,556 23,742 23,509
Basic income per share from continuing operations (in dollars per share) $ 1.65 $ 1.32 $ 5.14 $ 3.62
Basic distributed income per share from continuing operations applicable to common stockholders (in dollars per share) (0.20) (0.16) (0.56) (0.45)
Basic undistributed income per share from continuing operations applicable to common stockholders (in dollars per share) $ 1.45 $ 1.16 $ 4.58 $ 3.17
Distributed income applicable to common stockholders $ 4,745,000 $ 3,765,000 $ 13,303,000 $ 10,578,000
Undistributed income from continuing operations applicable to common stockholders $ 34,417,000 $ 27,384,000 $ 108,789,000 $ 74,546,000
Weighted average number of shares from stock options (in shares) 191 241 196 266
Conversion of Class B to Class A common shares outstanding (in shares) 2,562 2,562 2,562 2,562
Shares used in diluted per share calculations (in shares) 26,480 26,359 26,500 26,337
Diluted net income per share (in dollars per share) $ 1.64 $ 1.31 $ 5.10 $ 3.58
Diluted distributed income per share from continuing operations applicable to common stockholders (in dollars per share) (0.20) (0.16) (0.56) (0.45)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in dollars per share) $ 1.44 $ 1.15 $ 4.54 $ 3.13
Common Class B [Member] | Distributed [Member]        
Reallocation of distributed income as a result of conversion of dilutive stock options $ (3,000) $ (3,000) $ (11,000) $ (12,000)
Common Class B [Member] | Diluted [Member]        
Distributed income applicable to common stockholders (509,000) (406,000) (1,425,000) (1,141,000)
Distributed income applicable to common stockholders 509,000 406,000 1,425,000 1,141,000
Undistributed income from continuing operations applicable to common stockholders 3,690,000 2,951,000 11,653,000 8,042,000
Common Class B [Member] | Undistributed [Member]        
Reallocation of distributed income as a result of conversion of dilutive stock options (27,000) (28,000) (86,000) (82,000)
Common Class B [Member]        
Income from continuing operations, net of income tax 4,229,000 3,388,000 13,175,000 9,277,000
Distributed income applicable to common stockholders (512,000) (409,000) (1,436,000) (1,153,000)
Basic undistributed income from continuing operations applicable to common stockholders $ 3,717,000 $ 2,979,000 $ 11,739,000 $ 8,124,000
Shares used in basic per share calculations (in shares) 2,562 2,562 2,562 2,562
Basic income per share from continuing operations (in dollars per share) $ 1.65 $ 1.32 $ 5.14 $ 3.62
Basic distributed income per share from continuing operations applicable to common stockholders (in dollars per share) (0.20) (0.16) (0.56) (0.45)
Basic undistributed income per share from continuing operations applicable to common stockholders (in dollars per share) $ 1.45 $ 1.16 $ 4.58 $ 3.17
Distributed income applicable to common stockholders $ 512,000 $ 409,000 $ 1,436,000 $ 1,153,000
Undistributed income from continuing operations applicable to common stockholders $ 3,717,000 $ 2,979,000 $ 11,739,000 $ 8,124,000
Shares used in diluted per share calculations (in shares) 2,562 2,562 2,562 2,562
Diluted net income per share (in dollars per share) $ 1.64 $ 1.31 $ 5.10 $ 3.58
Diluted distributed income per share from continuing operations applicable to common stockholders (in dollars per share) (0.20) (0.16) (0.56) (0.45)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in dollars per share) $ 1.44 $ 1.15 $ 4.54 $ 3.13
Income from continuing operations, net of income tax $ 43,391,000 $ 34,537,000 $ 135,267,000 $ 94,401,000
Shares used in basic per share calculations (in shares) 26,289 26,118 26,304 26,071
Basic income per share from continuing operations (in dollars per share) $ 1.65 $ 1.32 $ 5.14 $ 3.62
Shares used in diluted per share calculations (in shares) 26,480 26,359 26,500 26,337
Diluted net income per share (in dollars per share) $ 1.64 $ 1.31 $ 5.10 $ 3.71