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Note 5 - Stockholders' Equity (Details) - Dividends Paid - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Dividends Paid [Abstract] |  |  |  |
Dividend amount per share | $ 0.20 | $ 0.16 | $ 0.36 | $ 0.29
Total amount of dividend (in thousands) | $ 5,266 | $ 4,179 | $ 9,482 | $ 7,557

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