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Note 17 - Net Income Per Share of Class A and Class B Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Basic EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations applicable to common stockholders |  | $ | 165,172 |  |  | $ | 17,827 |  |  | $ | 122,246 |  |  | $ | 13,294 |  |  | $ | 94,532 |  |  | $ | 10,682 |
Distributed income applicable to common stockholders |  |  | (18,038 | ) |  |  | (1,947 | ) |  |  | (14,367 | ) |  |  | (1,562 | ) |  |  | (9,061 | ) |  |  | (1,024 | )
Basic undistributed income from continuing operations applicable to common stockholders |  | $ | 147,134 |  |  | $ | 15,880 |  |  | $ | 107,879 |  |  | $ | 11,732 |  |  | $ | 85,471 |  |  | $ | 9,658 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares out-standing used to calculate basic income per share |  |  | 23,729 |  |  |  | 2,561 |  |  |  | 23,559 |  |  |  | 2,562 |  |  |  | 23,185 |  |  |  | 2,620 |
Basic income from continuing operations per share applicable to common stockholders |  | $ | 6.96 |  |  | $ | 6.96 |  |  | $ | 5.19 |  |  | $ | 5.19 |  |  | $ | 4.08 |  |  | $ | 4.08 |
Basic distributed income per share applicable to common stockholders |  |  | (0.76 | ) |  |  | (0.76 | ) |  |  | (0.61 | ) |  |  | (61 | ) |  |  | (0.39 | ) |  |  | (0.39 | )
Basic undistributed income from continuing operations per share applicable to common stockholders |  | $ | 6.20 |  |  | $ | 6.20 |  |  | $ | 4.58 |  |  | $ | 4.58 |  |  | $ | 3.69 |  |  | $ | 3.69 |
Year Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed income applicable to common stockholders |  | $ | 18,038 |  |  | $ | 1,947 |  |  | $ | 14,367 |  |  | $ | 1,562 |  |  | $ | 9,061 |  |  | $ | 1,024 |
Reallocation of distributed income as a result of conversion of dilutive stock options |  |  | 15 |  |  |  | (15 | ) |  |  | 15 |  |  |  | (15 | ) |  |  | 15 |  |  |  | (15 | )
Reallocation of distributed income due to conversion of Class B to Class A |  |  | 1,932 |  |  |  | — |  |  |  | 1,547 |  |  |  | — |  |  |  | 1,009 |  |  |  | — |
Diluted distributed income applicable to common stockholders |  | $ | 19,985 |  |  | $ | 1,932 |  |  | $ | 15,929 |  |  | $ | 1,547 |  |  | $ | 10,085 |  |  | $ | 1,009 |
Undistributed income from continuing operations applicable to common stockholders |  | $ | 147,134 |  |  | $ | 15,880 |  |  | $ | 107,879 |  |  | $ | 11,732 |  |  | $ | 85,471 |  |  | $ | 9,658 |
Reallocation of undistributed income as a result of conversion of dilutive stock options |  |  | 120 |  |  |  | (120 | ) |  |  | 116 |  |  |  | (116 | ) |  |  | 142 |  |  |  | (142 | )
Reallocation of undistributed income due to conversion of Class B to Class A |  |  | 15,760 |  |  |  | — |  |  |  | 11,616 |  |  |  | — |  |  |  | 9,516 |  |  |  | — |
Diluted undistributed income from continuing operations applicable to common stockholders |  | $ | 163,014 |  |  | $ | 15,760 |  |  | $ | 119,611 |  |  | $ | 11,616 |  |  | $ | 95,129 |  |  | $ | 9,516 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic income per share |  |  | 23,729 |  |  |  | 2,561 |  |  |  | 23,559 |  |  |  | 2,562 |  |  |  | 23,185 |  |  |  | 2,620 |
Weighted average number of shares from stock options |  |  | 200 |  |  |  | — |  |  |  | 261 |  |  |  | — |  |  |  | 386 |  |  |  | — |
Conversion of Class B to Class A |  |  | 2,561 |  |  |  | — |  |  |  | 2,562 |  |  |  | — |  |  |  | 2,620 |  |  |  | — |
Weighted average number of shares outstanding used to calculate diluted income per share |  |  | 26,490 |  |  |  | 2,561 |  |  |  | 26,382 |  |  |  | 2,562 |  |  |  | 26,191 |  |  |  | 2,620 |
Year Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Diluted EPS |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Diluted income from continuing operations per share available to common stockholders |  | $ | 6.91 |  |  | $ | 6.91 |  |  | $ | 5.14 |  |  | $ | 5.14 |  |  | $ | 4.02 |  |  | $ | 4.02 |
Diluted distributed income from continuing operations per share applicable to common stockholders |  |  | (0.76 | ) |  |  | (0.76 | ) |  |  | (0.61 | ) |  |  | (0.61 | ) |  |  | (0.39 | ) |  |  | (0.39 | )
Diluted undistributed income from continuing operations per share applicable to common stockholders |  | $ | 6.15 |  |  | $ | 6.15 |  |  | $ | 4.53 |  |  | $ | 4.53 |  |  | $ | 3.63 |  |  | $ | 3.63 |
Antidilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable pursuant to stock options not included since they were antidilutive |  |  | 16 |  |  |  | — |  |  |  | 13 |  |  |  | — |  |  |  | 16 |  |  |  | — |

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