Note 8 - Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($)	Sep. 30, 2015	Sep. 30, 2016 USD ($)
Residential Portfolio Segment [Member] \| One- to Four-family Loan [Member]
Number of Modifications			2
Recorded Investment	$ 80,814		$ 80,814
Number of Modifications	0	0	2
Recorded Investment	$ 80,814		$ 80,814

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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