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Note 6 - Debt and Equity Securities (Details) - Gross Gains and Gross Losses Realized From the Sale of Securities - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Gross Gains and Gross Losses Realized From the Sale of Securities [Abstract] |  |  |
Gross gains from the sale of securities | $ 2,899 | $ 5,247 | $ 5,222
Gross losses from the sale of securities | (2,732) | (2,372) | (2,201)
Net gains from the sale of securities | $ 167 | $ 2,875 | $ 3,021

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26805-111562 + Details
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