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Note 5 - Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2016
Notes Tables |
Dividends Declared [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2016 |  |  | 2015 |
Dividend amount per share |  | $ | 0.20 |  |  | $ | 0.16 |
Total amount of dividend (in thousands) |  |  | 5,151 |  |  |  | 4,216 |

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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration