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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment [1] $ 15,543 $ 11,898 $ 15,543 [2] $ 11,898 [2] $ 16,311
Interest income recognized $ 172 $ 191 172 [2] 191 [2] 473
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     499 [1],[2] 452 [1],[2] 555
Interest income recognized     15 [2] 13 [2] 31
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     233 [1],[2] 254 [1],[2] 249
Interest income recognized     8 [2] 8 [2] 16
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     76 [1],[2] 81 [1],[2] 77
Interest income recognized     2 [2] 2 [2] 5
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     $ 2,678 [1],[2] $ 2,821 [1],[2] 2,773
Interest income recognized [2]          
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     $ 5,565 [1],[2] $ 5,032 [1],[2] 5,836
Interest income recognized     57 [2] 77 [2] 203
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     5,974 [1],[2] 3,140 [1],[2] 6,114
Interest income recognized     86 [2] 89 [2] 175
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment     518 [1],[2] 95 [1],[2] 707
Interest income recognized     $ 4 [2] 2 [2] $ 43
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Impaired Loans, Average Investment and Interest Income Recognized [Line Items]          
Average recorded investment [1],[2]       $ 23  
Interest income recognized [2]          
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[2] Only classes with impaired loans are shown.