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Note 8 - Net Income Per Share of Class A and Class B Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Three Months Ended June 30, |  | 2016 |  |  | 2015 |
Basic EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common stockholders |  | $ | 47,869 |  |  | $ | 3,559 |  |  | $ | 46,239 |  |  | $ | 4,984 |
Distributed net income applicable to common stockholders |  |  | (5,932 | ) |  |  | (441 | ) |  |  | (4,754 | ) |  |  | (512 | )
Basic undistributed net income applicable to common stockholders |  | $ | 41,937 |  |  | $ | 3,118 |  |  | $ | 41,485 |  |  | $ | 4,472 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income per share |  |  | 23,700 |  |  |  | 1,762 |  |  |  | 23,770 |  |  |  | 2,562 |
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share applicable to common stockholders |  | $ | 2.02 |  |  | $ | 2.02 |  |  | $ | 1.95 |  |  | $ | 1.95 |
Basic distributed net income per share applicable to common stockholders |  |  | (0.25 | ) |  |  | (0.25 | ) |  |  | (0.20 | ) |  |  | (0.20 | )
Basic undistributed net income per share applicable to common stockholders |  | $ | 1.77 |  |  | $ | 1.77 |  |  | $ | 1.75 |  |  | $ | 1.75 |
Three Months Ended June 30, |  | 2016 |  |  | 2015 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed net income applicable to common stockholders |  | $ | 5,932 |  |  | $ | 441 |  |  | $ | 4,754 |  |  | $ | 512 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  |  | 1 |  |  |  | (1 | ) |  |  | 3 |  |  |  | (3 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  |  | 440 |  |  |  | — |  |  |  | 509 |  |  |  | — |
Diluted distributed net income applicable to common stockholders |  | $ | 6,373 |  |  | $ | 440 |  |  | $ | 5,266 |  |  | $ | 509 |
Undistributed net income applicable to common stockholders |  | $ | 41,937 |  |  | $ | 3,118 |  |  | $ | 41,485 |  |  | $ | 4,472 |
Reallocation of undistributed net income as a result of conversion of dilutive stock options |  |  | 9 |  |  |  | (9 | ) |  |  | 28 |  |  |  | (28 | )
Reallocation of undistributed net income due to conversion of Class B to Class A |  |  | 3,109 |  |  |  | — |  |  |  | 4,444 |  |  |  | — |
Diluted undistributed net income from continuing operations applicable to common stockholders |  | $ | 45,055 |  |  | $ | 3,109 |  |  | $ | 45,957 |  |  | $ | 4,444 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income per share |  |  | 23,700 |  |  |  | 1,762 |  |  |  | 23,770 |  |  |  | 2,562 |
Weighted average number of shares from stock options |  |  | 72 |  |  |  | — |  |  |  | 164 |  |  |  | — |
Conversion of Class B to Class A common shares outstanding |  |  | 1,762 |  |  |  | — |  |  |  | 2,562 |  |  |  | — |
Weighted average number of shares outstanding used to calculate diluted net income per share |  |  | 25,534 |  |  |  | 1,762 |  |  |  | 26,496 |  |  |  | 2,562 |
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted net income per share applicable to common stockholders |  | $ | 2.01 |  |  | $ | 2.01 |  |  | $ | 1.93 |  |  | $ | 1.93 |
Diluted distributed net income per share applicable to common stockholders |  |  | (0.25 | ) |  |  | (0.25 | ) |  |  | (0.20 | ) |  |  | (0.20 | )
Diluted undistributed net income per share applicable to common stockholders |  | $ | 1.76 |  |  | $ | 1.76 |  |  | $ | 1.73 |  |  | $ | 1.73 |
Three Months Ended June 30, |  | 2016 |  |  | 2015 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Antidilutive Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | — |
Six Months Ended June 30, |  | 2016 |  |  | 2015 |
Basic EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common stockholders |  | $ | 84,445 |  |  | $ | 7,253 |  |  | $ | 82,929 |  |  | $ | 8,947 |
Distributed net income applicable to common stockholders |  |  | (10,612 | ) |  |  | (912 | ) |  |  | (8,559 | ) |  |  | (923 | )
Basic undistributed net income applicable to common stockholders |  | $ | 73,833 |  |  | $ | 6,341 |  |  | $ | 74,370 |  |  | $ | 8,024 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income per share |  |  | 23,611 |  |  |  | 2,028 |  |  |  | 23,748 |  |  |  | 2,562 |
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share applicable to common stockholders |  | $ | 3.58 |  |  | $ | 3.58 |  |  | $ | 3.49 |  |  | $ | 3.49 |
Basic distributed net income per share applicable to common stockholders |  |  | (0.45 | ) |  |  | (0.45 | ) |  |  | (0.36 | ) |  |  | (0.36 | )
Basic undistributed net income per share applicable to common stockholders |  | $ | 3.13 |  |  | $ | 3.13 |  |  | $ | 3.13 |  |  | $ | 3.13 |
Six Months Ended June 30, |  | 2016 |  |  | 2015 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed net income applicable to common stockholders |  | $ | 10,612 |  |  | $ | 912 |  |  | $ | 8,559 |  |  | $ | 923 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  |  | 5 |  |  |  | (5 | ) |  |  | 7 |  |  |  | (7 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  |  | 907 |  |  |  | — |  |  |  | 916 |  |  |  | — |
Diluted distributed net income applicable to common stockholders |  | $ | 11,524 |  |  | $ | 907 |  |  | $ | 9,482 |  |  | $ | 916 |
Undistributed net income applicable to common stockholders |  | $ | 73,833 |  |  | $ | 6,341 |  |  | $ | 74,370 |  |  | $ | 8,024 |
Reallocation of undistributed net income as a result of conversion of dilutive stock options |  |  | 28 |  |  |  | (28 | ) |  |  | 61 |  |  |  | (61 | )
Reallocation of undistributed net income due to conversion of Class B to Class A |  |  | 6,313 |  |  |  | — |  |  |  | 7,963 |  |  |  | — |
Diluted undistributed net income applicable to common stockholders |  | $ | 80,174 |  |  | $ | 6,313 |  |  | $ | 82,394 |  |  | $ | 7,963 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income per share |  |  | 23,611 |  |  |  | 2,028 |  |  |  | 23,748 |  |  |  | 2,562 |
Weighted average number of shares from stock options |  |  | 115 |  |  |  | — |  |  |  | 199 |  |  |  | — |
Conversion of Class B to Class A common shares outstanding |  |  | 2,028 |  |  |  | — |  |  |  | 2,562 |  |  |  | — |
Weighted average number of shares outstanding used to calculate diluted net income per share |  |  | 25,754 |  |  |  | 2,028 |  |  |  | 26,509 |  |  |  | 2,562 |
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted net income per share applicable to common stockholders |  | $ | 3.56 |  |  | $ | 3.56 |  |  | $ | 3.47 |  |  | $ | 3.47 |
Diluted distributed net income per share applicable to common stockholders |  |  | (0.45 | ) |  |  | (0.45 | ) |  |  | (0.36 | ) |  |  | (0.36 | )
Diluted undistributed net income per share applicable to common stockholders |  | $ | 3.11 |  |  | $ | 3.11 |  |  | $ | 3.11 |  |  | $ | 3.11 |
Six Months Ended June 30, |  | 2016 |  |  | 2015 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Antidilutive Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive |  |  | 10 |  |  |  | — |  |  |  | 16 |  |  |  | — |

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