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Note 17 - Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Real Estate Acquired Through Foreclosure	$ 32,118,000	$ 26,895,000
Impaired Financing Receivable, Related Allowance	338,000	680,000
Collateral Dependent Loans [Member]
Impaired Financing Receivable, Related Allowance	$ 2,195,000	2,384,000
Commercial and Residential Real Estate Collateral [Member] | Minimum [Member]
Fair Value Percentage Of Collateral Discount	10.00%
Commercial and Residential Real Estate Collateral [Member] | Maximum [Member]
Fair Value Percentage Of Collateral Discount	40.00%
Foreclosed Assets Not Covered By FDIC Loss Share [Member]
Real Estate Acquired Through Foreclosure	$ 32,100,000	$ 26,900,000
Special Mention Or Worse [Member]
Collateral Dependent Loans Amount At Which All Loans Are Tested	$ 1,500,000

X

- Definition

For collateral dependent loans, impairment testing for all loans begins at this amount.

+ References

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- Definition

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+ References

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X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04(c)(Schedule III))
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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