Note 5 - Loans- Loans Modified and Classified as TDR (Details) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Number	3	1
Balance	$ 951	$ 1,620
Commercial Business and Other [Member] \| Extended Maturity [Member]
Number	3	1
Balance	$ 951	$ 1,620

Amount, after troubled debt restructuring, of modified financing receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration