Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	$ 14,810	$ 14,810		$ 18,097
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	11,636	11,636		13,840
Pre-Modification Recorded Investment		1,520	$ 4,065
Post-Modification Recorded Investment		1,520	4,065
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	3,174	3,174		4,257
Residential Portfolio Segment [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,003	1,003		520
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,003	1,003		520
Pre-Modification Recorded Investment		495
Post-Modification Recorded Investment		495
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Recorded Investment	1,025
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	498	498		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	233	233		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	610	610		627
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	2,023	2,023		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	2,849	2,849		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	399	399		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	498	498		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	610	610		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	2,023	2,023		1,046
Pre-Modification Recorded Investment		1,025	762
Post-Modification Recorded Investment		1,025	762
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	300	300		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	399	399		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	233	233		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	2,549	2,549		4,013
Commercial Portfolio Segment [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	6,381	6,381		6,429
Commercial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	392	392		395
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	6,381	6,381		6,429
Pre-Modification Recorded Investment			2,908
Post-Modification Recorded Investment			2,908
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings				395
Pre-Modification Recorded Investment			395
Post-Modification Recorded Investment			$ 395
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	392	392
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