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Note 8 - Net Income Per Share of Class A and Class B Common Stock - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Common Class A [Member] | Employee Stock Option [Member] |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) |  | 18 |  | 17
Common Class A [Member] | Distributed [Member] |  |  |  |
Effect of dilutive stock options on net income | $ 1 | $ 3 | $ 5 | $ 11
Conversion of Class B to Class A common shares outstanding | 439 | 509 | 1,365 | 1,425
Common Class A [Member] | Undistributed [Member] |  |  |  |
Effect of dilutive stock options on net income | 13 | 27 | 42 | 86
Conversion of Class B to Class A common shares outstanding | 3,326 | 3,690 | 9,794 | 11,653
Common Class A [Member] |  |  |  |
Net income applicable to common stockholders - basic | 50,262 | 39,162 | 134,533 | 122,092
Net income applicable to common stockholders - diluted | $ 54,041 | $ 43,391 | $ 145,739 | $ 135,267
Shares used in basic per share calculations (in shares) | 23,432 | 23,727 | 23,530 | 23,742
Conversion of Class B common shares into Class A common shares (in shares) | 1,762 | 2,562 | 1,960 | 2,562
Effect of dilutive stock options on weighted average common shares (in shares) | 96 | 191 | 108 | 196
Shares used in diluted per share calculations (in shares) | 25,290 | 26,480 | 25,598 | 26,500
Basic net income per Class A and Class B share (in dollars per share) | $ 2.14 | $ 1.65 | $ 5.72 | $ 5.14
Diluted net income per Class A and Class B share (in dollars per share) | $ 2.14 | $ 1.64 | $ 5.69 | $ 5.10
Common Class B [Member] | Employee Stock Option [Member] |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive (in shares) |  |  |  |
Common Class B [Member] | Distributed [Member] |  |  |  |
Effect of dilutive stock options on net income | $ (1) | $ (3) | $ (5) | $ (11)
Conversion of Class B to Class A common shares outstanding |  |  |  |
Common Class B [Member] | Undistributed [Member] |  |  |  |
Effect of dilutive stock options on net income | (13) | (27) | (42) | (86)
Conversion of Class B to Class A common shares outstanding |  |  |  |
Common Class B [Member] |  |  |  |
Net income applicable to common stockholders - basic | 3,779 | 4,229 | 11,206 | 13,175
Net income applicable to common stockholders - diluted | $ 3,765 | $ 4,199 | $ 11,159 | $ 13,078
Shares used in basic per share calculations (in shares) | 1,762 | 2,562 | 1,960 | 2,562
Conversion of Class B common shares into Class A common shares (in shares) |  |  |  |
Effect of dilutive stock options on weighted average common shares (in shares) |  |  |  |
Shares used in diluted per share calculations (in shares) | 1,762 | 2,562 | 1,960 | 2,562
Basic net income per Class A and Class B share (in dollars per share) | $ 2.14 | $ 1.65 | $ 5.72 | $ 5.14
Diluted net income per Class A and Class B share (in dollars per share) | $ 2.14 | $ 1.64 | $ 5.69 | $ 5.10
Shares used in basic per share calculations (in shares) | 25,194 | 26,289 | 25,490 | 26,304
Shares used in diluted per share calculations (in shares) | 25,290 | 26,480 | 25,598 | 26,500
Basic net income per Class A and Class B share (in dollars per share) | $ 2.15 | $ 1.65 | $ 5.72 | $ 5.14
Diluted net income per Class A and Class B share (in dollars per share) | $ 2.14 | $ 1.64 | $ 5.69 | $ 5.10

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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 Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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