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Note 8 - Net Income Per Share of Class A and Class B Common Stock (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Three Months Ended September 30, |  | 2016 |  |  | 2015 |
(in thousands, except per share data) |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Net income applicable to common stockholders - basic |  | $ | 50,262 |  |  | $ | 3,779 |  |  | $ | 39,162 |  |  | $ | 4,229 |
Reallocation of net income as a result of conversion of dilutive stock options |  |  | 1 |  |  |  | (1 | ) |  |  | 3 |  |  |  | (3 | )
Reallocation of net income due to conversion of Class B to Class A common shares outstanding |  |  | 439 |  |  |  | — |  |  |  | 509 |  |  |  | — |
Conversion of Class B common shares into Class A common shares |  |  | 3,326 |  |  |  | — |  |  |  | 3,690 |  |  |  | — |
Effect of dilutive stock options on net income |  |  | 13 |  |  |  | (13 | ) |  |  | 27 |  |  |  | (27 | )
Net income applicable to common stockholders - diluted |  | $ | 54,041 |  |  | $ | 3,765 |  |  | $ | 43,391 |  |  | $ | 4,199 |
Weighted average common shares outstanding – basic |  |  | 23,432 |  |  |  | 1,762 |  |  |  | 23,727 |  |  |  | 2,562 |
Conversion of Class B common shares into Class A common shares |  |  | 1,762 |  |  |  | — |  |  |  | 2,562 |  |  |  | — |
Effect of dilutive stock options on weighted average common shares |  |  | 96 |  |  |  | — |  |  |  | 191 |  |  |  | — |
Weighted average common shares outstanding – diluted |  |  | 25,290 |  |  |  | 1,762 |  |  |  | 26,480 |  |  |  | 2,562 |
Net income per common share - basic |  | $ | 2.14 |  |  | $ | 2.14 |  |  | $ | 1.65 |  |  | $ | 1.65 |
Net income per common share - diluted |  | $ | 2.14 |  |  | $ | 2.14 |  |  | $ | 1.64 |  |  | $ | 1.64 |
Three Months Ended September 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 |  |  | — |  |  |  | — |  |  |  | 18 |  |  |  | — |
Nine Months Ended September 30, |  | 2016 |  |  | 2015 |
(in thousands, except per share data) |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Net income applicable to common stockholders - basic |  | $ | 134,533 |  |  | $ | 11,206 |  |  | $ | 122,092 |  |  | $ | 13,175 |
Reallocation of net income as a result of conversion of dilutive stock options |  |  | 5 |  |  |  | (5 | ) |  |  | 11 |  |  |  | (11 | )
Reallocation of net income due to conversion of Class B to Class A common shares outstanding |  |  | 1,365 |  |  |  | — |  |  |  | 1,425 |  |  |  | — |
Conversion of Class B common shares into Class A common shares |  |  | 9,794 |  |  |  | — |  |  |  | 11,653 |  |  |  | — |
Effect of dilutive stock options on net income |  |  | 42 |  |  |  | (42 | ) |  |  | 86 |  |  |  | (86 | )
Net income applicable to common stockholders - diluted |  | $ | 145,739 |  |  | $ | 11,159 |  |  | $ | 135,267 |  |  | $ | 13,078 |
Weighted average common shares outstanding – basic |  |  | 23,530 |  |  |  | 1,960 |  |  |  | 23,742 |  |  |  | 2,562 |
Conversion of Class B common shares into Class A common shares |  |  | 1,960 |  |  |  | — |  |  |  | 2,562 |  |  |  | — |
Effect of dilutive stock options on weighted average common shares |  |  | 108 |  |  |  | — |  |  |  | 196 |  |  |  | — |
Weighted average common shares outstanding – diluted |  |  | 25,598 |  |  |  | 1,960 |  |  |  | 26,500 |  |  |  | 2,562 |
Net income per common share - basic |  | $ | 5.72 |  |  | $ | 5.72 |  |  | $ | 5.14 |  |  | $ | 5.14 |
Net income per common share - diluted |  | $ | 5.69 |  |  | $ | 5.69 |  |  | $ | 5.10 |  |  | $ | 5.10 |
Nine Months Ended September 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 |  |  |  | — |

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