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Note 5 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Class of Treasury Stock [Table Text Block] |
|  | Repurchases Occurring in the Six Months Ended June 30, 2016 |  |  | Cumulative Repurchases as of June 30, 2016 |
|  | Shares |  |  | Average Price |  |  | Shares |  |  | Average Price |
2011 Share Repurchase Authorization |  |  | 599,123 |  |  | $ | 79.21 |  |  |  | 2,327,636 |  |  | $ | 51.09 |
2016 Share Repurchase Authorization |  |  | 622,225 |  |  | $ | 78.52 |  |  |  | 622,225 |  |  | $ | 78.52 |
Dividends Declared [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Dividend amount per share |  | $ | 0.25 |  |  | $ | 0.20 |  |  | $ | 0.45 |  |  | $ | 0.36 |
Total amount of dividend (in thousands) |  |  | 6,373 |  |  |  | 5,266 |  |  |  | 11,524 |  |  |  | 9,482 |

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