Note 4 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	$ 16,664
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	13,666
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	2,998
Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	456
Commercial Real Estate Owner Occupied [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	232
Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	598
Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,964
Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	204
Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	456
Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	598
Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	1,964
Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	204
Commercial Real Estate Owner Occupied [Member] | Nonperforming Financial Instruments [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	232
Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	2,914
Commercial Real Estate Nonowner Occupied [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	393
Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	581
Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	539
Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	393
Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	581
Commercial Real Estate Nonowner Occupied [Member] | Nonperforming Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	2,375
Residential Portfolio Segment [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	730	$ 1,001
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	730	1,001
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		433
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		232
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		604
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		1,996
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
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		433
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Reduction of Principal and Interest Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		604
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		1,996
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		204
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Nonperforming Financial Instruments [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		232
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		2,773
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		396
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		300
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		396
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Nonperforming Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		2,473
Commercial and Industrial Portfolio Segment [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		7,579
Commercial and Industrial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		617
Commercial and Industrial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		7,579
Commercial and Industrial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		226
Commercial and Industrial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		391
Commercial and Industrial Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	7,544
Commercial and Industrial Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	830
Commercial and Industrial Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	7,544
Commercial and Industrial Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	439
Commercial and Industrial Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Nonperforming Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	391
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		16,053
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		12,957
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings		3,096
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	218	218
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Trouble Debt Restructurings	$ 218	$ 218