Note 10 - Fair Value Measurements - Fair Value of Assets on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans	$ 65	$ 151
Foreclosed assets		619
Fair Value, Inputs, Level 1 [Member]
Loans
Foreclosed assets
Fair Value, Inputs, Level 2 [Member]
Loans
Foreclosed assets
Fair Value, Inputs, Level 3 [Member]
Loans	65	151
Foreclosed assets		$ 619

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant