Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Expiration Period Of Letter Of Credit Issued	1 year
Advances from Federal Home Loan Banks, Total	$ 40,000	$ 44,000
Letter of Credit Issued by FHLB to Guarantee Public Funds Deposit Balances [Member]
Advances from Federal Home Loan Banks, Total	$ 18,000

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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