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Note 8 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Paid Quarterly [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.017 | $ 0.017 |  |  |
Payments of Dividends |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.3 | $ 3.3 | $ 2.8
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |

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