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Note 8 - Net Income Per Share of Class A and Class B Common Stock (Tables) | 3 Months Ended
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Mar. 31, 2016
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Three Months Ended March 31, |  | 2016 |  |  | 2015 |
Basic EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income applicable to common stockholders |  | $ | 36,692 |  |  | $ | 3,578 |  |  | $ | 36,690 |  |  | $ | 3,963 |
Distributed net income applicable to common stockholders |  |  | (4,693 | ) |  |  | (458 | ) |  |  | (3,805 | ) |  |  | (411 | )
Basic undistributed net income applicable to common stockholders |  | $ | 31,999 |  |  | $ | 3,120 |  |  | $ | 32,885 |  |  | $ | 3,552 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income per share |  |  | 23,522 |  |  |  | 2,294 |  |  |  | 23,721 |  |  |  | 2,562 |
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share applicable to common stockholders |  | $ | 1.56 |  |  | $ | 1.56 |  |  | $ | 1.55 |  |  | $ | 1.55 |
Basic distributed net income per share applicable to common stockholders |  |  | (0.20 | ) |  |  | (0.20 | ) |  |  | (0.16 | ) |  |  | (0.16 | )
Basic undistributed net income per share applicable to common stockholders |  | $ | 1.36 |  |  | $ | 1.36 |  |  | $ | 1.39 |  |  | $ | 1.39 |
Three Months Ended March 31, |  | 2016 |  |  | 2015 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed net income applicable to common stockholders |  | $ | 4,693 |  |  | $ | 458 |  |  | $ | 3,805 |  |  | $ | 411 |
Reallocation of distributed net income as a result of conversion of dilutive stock options |  |  | 3 |  |  |  | (3 | ) |  |  | 4 |  |  |  | (4 | )
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  |  | 455 |  |  |  | — |  |  |  | 407 |  |  |  | — |
Diluted distributed net income applicable to common stockholders |  | $ | 5,151 |  |  | $ | 455 |  |  | $ | 4,216 |  |  | $ | 407 |
Undistributed net income applicable to common stockholders |  | $ | 31,999 |  |  | $ | 3,120 |  |  | $ | 32,885 |  |  | $ | 3,552 |
Reallocation of undistributed net income as a result of conversion of dilutive stock options |  |  | 18 |  |  |  | (18 | ) |  |  | 32 |  |  |  | (32 | )
Reallocation of undistributed net income due to conversion of Class B to Class A |  |  | 3,102 |  |  |  | — |  |  |  | 3,520 |  |  |  | — |
Diluted undistributed net income applicable to common stockholders |  | $ | 35,119 |  |  | $ | 3,102 |  |  | $ | 36,437 |  |  | $ | 3,520 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income per share |  |  | 23,522 |  |  |  | 2,294 |  |  |  | 23,721 |  |  |  | 2,562 |
Weighted average number of shares from stock options |  |  | 157 |  |  |  | — |  |  |  | 236 |  |  |  | — |
Conversion of Class B to Class A common shares outstanding |  |  | 2,294 |  |  |  | — |  |  |  | 2,562 |  |  |  | — |
Weighted average number of shares outstanding used to calculate diluted net income per share |  |  | 25,973 |  |  |  | 2,294 |  |  |  | 26,519 |  |  |  | 2,562 |
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted net income per share applicable to common stockholders |  | $ | 1.55 |  |  | $ | 1.55 |  |  | $ | 1.53 |  |  | $ | 1.53 |
Diluted distributed net income per share applicable to common stockholders |  |  | (0.20 | ) |  |  | (0.20 | ) |  |  | (0.16 | ) |  |  | (0.16 | )
Diluted undistributed net income per share applicable to common stockholders |  | $ | 1.35 |  |  | $ | 1.35 |  |  | $ | 1.37 |  |  | $ | 1.37 |
Three Months Ended March 31, |  | 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 |  |  | 20 |  |  |  | — |  |  |  | 15 |  |  |  | —

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