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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loans and Leases Receivable, Deferred Income $ 2,000,000     $ 2,000,000   $ 1,700,000
Financing Receivable, Modifications, Recorded Investment 2,400,000     2,400,000   2,700,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans       398,000   $ 309,000
Provision for Loan, Lease, and Other Losses $ 280,000   $ 105,000 $ 615,000 $ 315,000  
Financing Receivable, Modifications, Number of Contracts     0      
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 33,000        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 1   0    
Threshold For Loans Evaluated For Impairment [Member]            
Loans and Leases Receivable, before Fees, Gross $ 1,000,000     $ 1,000,000    
Threshold For Loans Evaluated For Impairment [Member] | Outside Consultant [Member]            
Loans and Leases Receivable, before Fees, Gross 250,000     250,000    
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member]            
Financing Receivable, Gross 125,000     125,000    
Residential Loan [Member] | Real Estate Mortgage Portfolio Segment [Member]            
Provision for Loan, Lease, and Other Losses $ 24,000   $ 40,000 $ (967,000) $ (97,000)  
Financing Receivable, Modifications, Number of Contracts 1     3 1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 58,000      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1      
Commercial Loans [Member] | Real Estate Mortgage Portfolio Segment [Member]            
Provision for Loan, Lease, and Other Losses $ (420,000)   $ (14,000) $ 476,000 $ 747,000