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Note 4 - Loans Receivables and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impaired loans with no related allowance recorded, recorded investment $ 6,500,000 $ 8,720,000  
Impaired loans with no related allowance recorded, unpaid principal balance 7,295,000 10,267,000  
Impaired loans with a related allowance recorded, recorded investment 253,000 231,000  
Impaired loans with a related allowance recorded, unpaid principal balance 253,000 231,000  
Impaired loans, related allowance 253,000 231,000  
Impaired loans, recorded investment 6,753,000 8,951,000  
Impaired loans, unpaid principal balance 7,548,000 10,498,000  
With no allowance recorded, average recorded investment 8,638,000 12,056,000 $ 12,063,000
With no allowance recorded, interest income recognized 135,000 340,000 517,000
With allowance recorded, average recorded investment 243,000 2,205,000 3,000
With allowance recorded, interest income recognized
Impaired Loans, Average recorded investment 8,881,000 14,261,000 12,066,000
Impaired Loans, interest income recognized 135,000 340,000 517,000
Commercial Real Estate Portfolio Segment [Member]      
Impaired loans with no related allowance recorded, recorded investment 1,977,000 6,267,000  
Impaired loans with no related allowance recorded, unpaid principal balance 2,425,000 6,721,000  
Impaired loans with a related allowance recorded, recorded investment  
Impaired loans with a related allowance recorded, unpaid principal balance  
Impaired loans, related allowance  
Impaired loans, recorded investment 1,977,000 6,267,000  
Impaired loans, unpaid principal balance 2,425,000 6,721,000  
With no allowance recorded, average recorded investment 5,832,000 6,929,000 8,001,000
With no allowance recorded, interest income recognized 102,000 312,000 373,000
With allowance recorded, average recorded investment 65,000
With allowance recorded, interest income recognized
Impaired Loans, Average recorded investment 5,832,000 6,994,000 8,001,000
Impaired Loans, interest income recognized 102,000 312,000 373,000
Residential Portfolio Segment [Member]      
Impaired loans with no related allowance recorded, recorded investment 3,336,000 1,911,000  
Impaired loans with no related allowance recorded, unpaid principal balance 3,369,000 2,915,000  
Impaired loans with a related allowance recorded, recorded investment  
Impaired loans with a related allowance recorded, unpaid principal balance  
Impaired loans, related allowance  
Impaired loans, recorded investment 3,336,000 1,911,000  
Impaired loans, unpaid principal balance 3,369,000 2,915,000  
With no allowance recorded, average recorded investment 2,016,000 4,318,000 3,512,000
With no allowance recorded, interest income recognized 11,000 9,000 126,000
With allowance recorded, average recorded investment
With allowance recorded, interest income recognized
Impaired Loans, Average recorded investment 2,016,000 4,318,000 3,512,000
Impaired Loans, interest income recognized 11,000 9,000 126,000
Commercial Portfolio Segment [Member]      
Impaired loans with no related allowance recorded, recorded investment 497,000  
Impaired loans with no related allowance recorded, unpaid principal balance 683,000  
Impaired loans with a related allowance recorded, recorded investment 251,000 231,000  
Impaired loans with a related allowance recorded, unpaid principal balance 251,000 231,000  
Impaired loans, related allowance 251,000 231,000  
Impaired loans, recorded investment 748,000 231,000  
Impaired loans, unpaid principal balance 934,000 231,000  
With no allowance recorded, average recorded investment 197,000 265,000
With no allowance recorded, interest income recognized
With allowance recorded, average recorded investment 243,000 2,138,000
With allowance recorded, interest income recognized
Impaired Loans, Average recorded investment 440,000 2,403,000
Impaired Loans, interest income recognized
Consumer Portfolio Segment [Member]      
Impaired loans with no related allowance recorded, recorded investment 690,000 542,000  
Impaired loans with no related allowance recorded, unpaid principal balance 818,000 631,000  
Impaired loans with a related allowance recorded, recorded investment 2,000  
Impaired loans with a related allowance recorded, unpaid principal balance 2,000  
Impaired loans, related allowance 2,000  
Impaired loans, recorded investment 692,000 542,000  
Impaired loans, unpaid principal balance 820,000 631,000  
With no allowance recorded, average recorded investment 593,000 544,000 550,000
With no allowance recorded, interest income recognized 22,000 19,000 18,000
With allowance recorded, average recorded investment 2,000 3,000
With allowance recorded, interest income recognized
Impaired Loans, Average recorded investment 593,000 546,000 553,000
Impaired Loans, interest income recognized $ 22,000 $ 19,000 $ 18,000