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Note 6 - Loans Receivable and Allowance for Loan Losses (Details Textual)
3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Commercial Portfolio Segment [Member] | Modified Commercial and Industrial Loan [Member]            
Proceeds from Loans     $ 350,000      
Loans Receivable Transitioned to Other Assets, Amount       $ 850,000    
Other Assets $ 586,000       $ 586,000  
Commercial Portfolio Segment [Member]            
Financing Receivable, Modifications, Number of Contracts           1
Financing Receivable, Modifications, Pre-Modification Recorded Investment           $ 1,200,000
Financing Receivable, Modifications, Post-Modification Recorded Investment           1,200,000
Residential Portfolio Segment [Member]            
Real Estate Acquired Through Foreclosure 126,000     193,000 126,000  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 271,000 $ 110,000     $ 784,000 $ 573,000
Financing Receivable, Modifications, Number of Contracts 0       0  
Other Assets $ 21,986,000     20,761,000 $ 21,986,000  
Real Estate Acquired Through Foreclosure $ 10,271,000     11,313,000 $ 10,271,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0       0 1
Mortgage Loans in Process of Foreclosure, Amount $ 0     $ 0 $ 0