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Note 5 - Loans Receivable and the Allowance for Loan Losses (Details Textual)
1 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
contract
loan
Dec. 31, 2015
USD ($)
contract
loan
Dec. 31, 2014
USD ($)
Accounts Notes And Loans Receivable [Line Items]        
Bank Overdrafts   $ 171,000 $ 203,000  
Loss on sale of indirect lease financing portfolio $ (223,000) (223,000)    
Reversal of allowance for loan losses $ 220,000      
Financing Receivable, Modifications, Recorded Investment   5,374,000 2,278,000  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down   $ 0 $ 5,000 $ 909,000
Number of TDRs | contract   16 3  
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 30,000 $ 1,919,000  
Performing Financial Instruments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment   1,819,000 1,288,000  
Nonperforming Financial Instruments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment   $ 3,555,000 $ 990,000  
Residential Portfolio Segment [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Mortgage Loan on Real Estate Number of Loan in Foreclosure | loan   0 7  
Mortgage Loans in Process of Foreclosure, Amount   $ 0 $ 197,000  
Residential Portfolio Segment [Member] | Maximum [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loan to Value Ratio   80.00%