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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

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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