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Note 5 - Concentration of Credit Risk (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Unsecured Loan Limit, Percentage of Shareholders' Equity, California Financial Code 15.00%  
Secured and Unsecured Loan Limit Percentage, California Financial Code 25.00%  
Concentration Risk, Issuer Relationships 77  
Loan Commitments and Standby Letters of Credit Related to Real Estate Loans $ 49,166 $ 53,891
Concentration Risk, Aggregate Securities Amount $ 5,000  
Commercial Real Estate Loans [Member]    
Loan To Value Ratio Requirement 75.00%  
Residential Real Estate Loans [Member]    
Loan To Value Ratio Requirement 80.00%  
Aggregate Loans [Member] | Customer Concentration Risk [Member]    
Concentration Risk, Issuer Relationships 33  
Concentration Risk, Aggregate Loans Amount $ 5,000