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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities available-for-sale, amortized costs	$ 475,163	$ 336,075
Securities available-for-sale, gross unrealized gains	2,309	954
Securities available-for-sale, gross unrealized losses	9,967	5,642
Securities available-for-sale, fair values	467,505	331,387
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	336,446	312,604
Securities available-for-sale, gross unrealized gains	379	609
Securities available-for-sale, gross unrealized losses	8,782	5,494
Securities available-for-sale, fair values	328,043	307,719
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	131,020	16,853
Securities available-for-sale, gross unrealized gains	1,866	100
Securities available-for-sale, gross unrealized losses	957	119
Securities available-for-sale, fair values	131,929	16,834
Collateralized Mortgage Backed Securities [Member]
Securities available-for-sale, amortized costs	696	602
Securities available-for-sale, gross unrealized gains	56	57
Securities available-for-sale, gross unrealized losses	0	0
Securities available-for-sale, fair values	752	659
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	7,001	6,016
Securities available-for-sale, gross unrealized gains	8	188
Securities available-for-sale, gross unrealized losses	228	29
Securities available-for-sale, fair values	$ 6,781	$ 6,175

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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