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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 |

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- 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 + Details
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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 + Details
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