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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Number Of Limited Partnerships In Housing Investments 10  
Percentage of Subsidiaries Common Securities Owned by Parent Company 100.00%  
Gross Loans Comprised of Commercial Mortgage Loans Percentage 48.30%  
Residential Mortgages Properties Percentage 26.50%  
Gross Loans Comprised of Commercial Loans Percentage 18.10%  
Federal Home Loan Bank Stock $ 17,250 $ 18,090
Federal Home Loan Bank Stock Shares (in shares) | shares 172,500  
Minimum Stock Requirement on Outstanding Federal Home Loan Bank Borrowings Shares (in shares) | shares 150,000  
Maximum Loan Size Portfolio Stratification Homogenous Portfolio $ 500  
Variable Interest Entity, Primary Beneficiary, Number of Entities 10  
Goodwill, Impairment Loss $ 0  
Number of Reportable Segments 1  
California [Member]    
Residential Mortgages Properties Percentage 52.00%