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Note 3 - Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-taxable
Total	$ 40,115	$ 33,479	$ 30,613
Held-to-maturity Securities [Member]
Taxable
Taxable	2,521	3,778	5,162
Non-taxable
Non-taxable	8,693	10,641	11,635
Available-for-sale Securities [Member]
Taxable
Taxable	25,996	17,928	12,129
Non-taxable
Non-taxable	$ 2,905	$ 1,132	$ 1,687

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Interest income, securities, operating, by non-0taxable status [abstract]

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- Definition

Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
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-Subparagraph (SX 210.9-04.2)
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(b))
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