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Note 10 - Term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Advances from Federal Home Loan Banks, Total   $ 5,000 $ 0  
Federal Home Loan Bank Stock   7,380 7,380  
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       0.12%
Federal Funds Purchased [Member] | Maximum [Member]        
Debt Instrument, Interest Rate, Stated Percentage       0.30%
Federal Reserve Bank Advances [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   6,500    
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]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   11,700    
Federal Home Loan Bank of San Francisco [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   370,200    
Advances from Federal Home Loan Banks, Total   5,000    
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding   8,300 9,600  
Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End   40,000 $ 40,000  
Federal Home Loan Bank of San Francisco [Member] | Real Estate [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   511,800    
Federal Home Loan Bank of San Francisco [Member] | Equity Securities [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 29,500    
Federal Home Loan Bank of San Francisco [Member] | Other Assets [Member]        
Federal Home Loan Bank Stock       $ 7,400