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Note 6 - Loans Receivable and Allowance for Loan Losses (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 184,000 $ 210,000 $ 363,000 $ 486,000  
Financing Receivable, Modifications, Number of Contracts 0   0    
Financing Receivable, Modifications, Recorded Investment $ 8,150,000   $ 8,150,000   $ 8,218,000
Financing Receivable, Modifications, Increase in Principal Balance         $ 421,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0   3   0
Mortgage Loans in Process of Foreclosure, Amount $ 0   $ 0   $ 0
Real Estate Acquired Through Foreclosure 6,559,000   6,559,000   6,966,000
Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications, Recorded Investment 1,524,000   1,524,000   $ 1,524,000
Commercial Portfolio Segment [Member] | Converted From Line of Credit to Term Loan With Five Year Maturity [Member]          
Financing Receivable, Modifications, Number of Contracts         1
Financing Receivable, Modifications, Recorded Investment         $ 975,000
Owner Occupied Real Estate [Member]          
Financing Receivable, Modifications, Recorded Investment 242,000   242,000   $ 242,000
Owner Occupied Real Estate [Member] | Contractual Interest Rate Reduction and Extended Maturity [Member]          
Financing Receivable, Modifications, Number of Contracts         1
Financing Receivable, Modifications, Recorded Investment         $ 245,000
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications, Recorded Investment 6,384,000   6,384,000   $ 6,452,000
Commercial Real Estate Portfolio Segment [Member] | Increase in Principal Balance and Reduction in Interest Rate [Member]          
Financing Receivable, Modifications, Number of Contracts         1
Financing Receivable, Modifications, Pre-Modification Recorded Investment         $ 6,500,000
Residential Portfolio Segment [Member]          
Financing Receivable, Modifications, Recorded Investment    
Real Estate Acquired Through Foreclosure $ 42,000   $ 42,000   $ 42,000