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Note 6 - Term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2021
Dec. 31, 2020
Advances from Federal Home Loan Banks, Total   $ 0 $ 5,000
Proceeds from Issuance of Senior Long-term Debt $ 10,000    
Federal Funds Purchased   0 0
Federal Funds Purchased [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 75,000  
Federal Funds Purchased [Member] | Minimum [Member]      
Debt Instrument, Interest Rate, Stated Percentage   0.17%  
Federal Funds Purchased [Member] | Maximum [Member]      
Debt Instrument, Interest Rate, Stated Percentage   0.35%  
Federal Reserve Bank Advances [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 26,800  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   0 0
Fixed to Floating Interest Rate [Member] | Subordinated Debt [Member]      
Debt Instrument, Interest Rate, Stated Percentage 6.88%    
Debt Issuance Costs, Gross $ 210    
Debt Fixed Interest Term (Year) 5 years    
Fixed to Floating Interest Rate [Member] | Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 5.26%    
Commercial Loans [Member] | Federal Reserve Bank Advances [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   48,200  
Federal Home Loan Bank of San Francisco [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   456,900  
Advances from Federal Home Loan Banks, Total   0 5,000
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding   1,900 8,300
Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End   5,000 $ 40,000
Federal Home Loan Bank of San Francisco [Member] | Real Estate [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   568,600  
Federal Home Loan Bank of San Francisco [Member] | Equity Securities [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   52,600  
Federal Home Loan Bank of San Francisco [Member] | Other Assets [Member]      
Federal Home Loan Bank Stock   $ 7,500