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Note 5 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Class of Treasury Stock [Table Text Block] |
|  | Repurchases Occurring in the Nine Months Ended September 30, 2016 |  |  | Cumulative Repurchases as of September 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 |  |  | 666,475 |  |  | $ | 78.90 |  |  |  | 666,475 |  |  | $ | 78.90 |
Dividends Declared [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Dividend amount per share |  | $ | 0.25 |  |  | $ | 0.20 |  |  | $ | 0.70 |  |  | $ | 0.56 |
Total amount of dividend (in thousands) |  |  | 6,299 |  |  |  | 5,257 |  |  |  | 17,823 |  |  |  | 14,739 |

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