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Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructuring by Accrual Status - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Troubled debt restructurings:    
TDR financing receivable $ 2,368 $ 4,046
Performing Financial Instruments [Member]    
Troubled debt restructurings:    
TDR financing receivable 1,725 1,900
Nonperforming Financial Instruments [Member]    
Troubled debt restructurings:    
TDR financing receivable 643 2,146
Troubled Debt Restructuring [Member]    
Troubled debt restructurings:    
Related allowance for loan losses 0 1,298
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Troubled debt restructurings:    
TDR financing receivable 662 658
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Troubled debt restructurings:    
TDR financing receivable 1,686 1,724
Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | Residential Loan [Member]    
Troubled debt restructurings:    
TDR financing receivable 347 492
Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Loan [Member]    
Troubled debt restructurings:    
TDR financing receivable 1,358 1,386
Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Residential Loan [Member]    
Troubled debt restructurings:    
TDR financing receivable 315 166
Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Loan [Member]    
Troubled debt restructurings:    
TDR financing receivable 328 338
Real Estate Mortgage Portfolio Segment [Member] | Troubled Debt Restructuring [Member] | Residential Loan [Member]    
Troubled debt restructurings:    
Related allowance for loan losses 0 6
Real Estate Mortgage Portfolio Segment [Member] | Troubled Debt Restructuring [Member] | Commercial Real Estate Loan [Member]    
Troubled debt restructurings:    
Related allowance for loan losses 0 0
Commercial Portfolio Segment [Member]    
Troubled debt restructurings:    
TDR financing receivable 0 1,642
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]    
Troubled debt restructurings:    
TDR financing receivable 0 0
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]    
Troubled debt restructurings:    
TDR financing receivable 0 1,642
Commercial Portfolio Segment [Member] | Troubled Debt Restructuring [Member]    
Troubled debt restructurings:    
Related allowance for loan losses 0 1,292
Consumer Portfolio Segment [Member] | Home Equity And Second Mortgage [Member]    
Troubled debt restructurings:    
TDR financing receivable 20 22
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity And Second Mortgage [Member]    
Troubled debt restructurings:    
TDR financing receivable 20 22
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity And Second Mortgage [Member]    
Troubled debt restructurings:    
TDR financing receivable 0 0
Consumer Portfolio Segment [Member] | Troubled Debt Restructuring [Member] | Home Equity And Second Mortgage [Member]    
Troubled debt restructurings:    
Related allowance for loan losses $ 0 $ 0