Note 5 - Commitments and Contingencies (Details Textual) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Standby Letters of Credit [Member]
Unused Commitments to Extend Credit	$ 625,000	$ 265,000
Construction Loan Payable [Member]
Unused Commitments to Extend Credit	8,751,000
Unused Commitments to Extend Credit	$ 87,483,000	$ 82,995,000

Unused amount of commitments to extend credit to customers.

No definition available.

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