Note 11 - Financial Instruments With Off-balance Sheet Risk (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Standby Letters of Credit [Member]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 12.6	$ 5.7
Commitments to Extend Credit [Member]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 264.3	$ 215.9

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant