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Note 8 - Dividends Paid (Details) - USD ($) $ in Thousands | 3 Months Ended
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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 | [1]
Dividend amount per share (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 |
Total amount of dividend | $ 5,246 | $ 5,257 | $ 5,266 | $ 4,216 | $ 4,198 | $ 4,174 | $ 4,179 | $ 3,378 | $ 3,366 | $ 3,363 | $ 3,356 |
[1] | We declared and paid a dividend payment in December 2012 in lieu of the dividend typically declared and paid in March of the following year.

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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