Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	$ 17,357	$ 17,357		$ 18,097
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	14,449	14,449		13,840
Pre-Modification Recorded Investment		495	$ 4,388
Post-Modification Recorded Investment		495	4,388
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	2,908	2,908		4,257
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Investment	495
Residential Portfolio Segment [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,007	1,007		520
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,007	1,007		520
Pre-Modification Recorded Investment		495
Post-Modification Recorded Investment		495
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	517	517		457
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	236	236		244
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	616	616		627
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,014	1,014		1,046
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	204	204		204
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	6,128	6,128		7,548
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	402	402		408
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	517	517		457
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	616	616		627
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,014	1,014		1,046
Pre-Modification Recorded Investment			767
Post-Modification Recorded Investment			767
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	204	204		204
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	3,456	3,456		3,535
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	402	402		408
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings				4,013
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	236	236		244
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	2,672	2,672		4,013
Commercial Portfolio Segment [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	6,622	6,622		6,429
Commercial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	393	393		395
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	6,622	6,622		6,429
Pre-Modification Recorded Investment			3,621
Post-Modification Recorded Investment			$ 3,621
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	393	393		395
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	218	218		219
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Loan [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	$ 218	$ 218		$ 219