Note 4 - Loans and Allowance for Loan Losses (Details) - TDRs Pre-Modification and Post-Modification - Performing Financial Instruments [Member] $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($)
Nonowner-occupied
TDR's Performing to Modified Terms	$ 819
TDR's Not Performing Modified Terms	819
Commercial Real Estate Portfolio Segment [Member] \| Interest Only Payments [Member]
Nonowner-occupied
TDR's Performing to Modified Terms	238
TDR's Not Performing Modified Terms	238
Commercial Real Estate Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Nonowner-occupied
TDR's Performing to Modified Terms	581
TDR's Not Performing Modified Terms	$ 581

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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