Note 9 - Securities Sold Under Agreements to Repurchase (Details) - Contractual Maturity of the Agreements - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Repurchase agreements:
U.S. Government agencies	$ 104,900	$ 100,800
US Government Agencies Debt Securities [Member]
Repurchase agreements:
U.S. Government agencies	104,937	100,771
Maturity Overnight [Member] \| US Government Agencies Debt Securities [Member]
Repurchase agreements:
U.S. Government agencies	97,616	93,454
Maturity Greater than 90 Days [Member] \| US Government Agencies Debt Securities [Member]
Repurchase agreements:
U.S. Government agencies	$ 7,321	$ 7,317

Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 7

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=55761124&loc=SL34722452-111729

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