Note 21 - Financial Instruments and Off-balance-sheet Activities (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Fair Value, Concentration of Risk, Commitments	$ 111,460,000	$ 92,740,000
Notional Amount of Interest Rate Lock Commitments	18,745,000	15,338,000
Letter of Credit [Member]
Fair Value, Concentration of Risk, Commitments	$ 3,925,000	$ 3,534,000
Minimum [Member]
Commitments to Extend Credit Estimated Completion or Termination Period		90 days
Commitments to Extend Credit Fixed Interest Rate	3.75%	3.25%
Maximum [Member]
Commitments to Extend Credit Estimated Completion or Termination Period		1 year
Commitments to Extend Credit Fixed Interest Rate	6.25%	5.00%

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(19))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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