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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 ($)
Dec. 31, 2017
USD ($)
contract
loan
Dec. 31, 2016
USD ($)
contract
loan
Dec. 31, 2015
USD ($)
Accounts Notes And Loans Receivable [Line Items]        
Bank Overdrafts   $ 126,000 $ 171,000  
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   4,315,000 5,374,000  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down   $ 3,000 $ 0 $ 5,000
Number of TDRs | contract   0 16  
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 0 $ 30,000  
Performing Financial Instruments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment   1,321,000 1,819,000  
Nonperforming Financial Instruments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Financing Receivable, Modifications, Recorded Investment   $ 2,994,000 $ 3,555,000  
Residential Portfolio Segment [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Mortgage Loan on Real Estate Number of Loan in Foreclosure | loan   3 0  
Mortgage Loans in Process of Foreclosure, Amount   $ 421,000 $ 0  
Residential Portfolio Segment [Member] | Maximum [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loan to Value Ratio   80.00%