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Note 6 - Term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2020
Dec. 31, 2019
Advances from Federal Home Loan Banks, Total   $ 10,000
Proceeds from Issuance of Senior Long-term Debt $ 10,000    
Proceeds from Issuance of Subordinated Long-term Debt $ 10,000    
Federal Funds Purchased   0 0
Federal Funds Purchased [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 35,000  
Federal Funds Purchased [Member] | Minimum [Member]      
Debt Instrument, Interest Rate, Stated Percentage   0.50%  
Federal Funds Purchased [Member] | Maximum [Member]      
Debt Instrument, Interest Rate, Stated Percentage   1.18%  
Federal Reserve Bank Advances [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   $ 0 0
Federal Home Loan Bank Advances [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   12,700  
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 Fixed Interest Term (Year) 5 years    
Debt Issuance Costs, Gross $ 210    
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 Home Loan Bank Advances [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   19,800  
Federal Home Loan Bank of San Francisco [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   412,400  
Advances from Federal Home Loan Banks, Total   10,000 0
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding   220 9,600
Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End   $ 10,000 $ 40,000
Federal Home Loan Bank, Advances, Weighted Average Interest Rate   0.21%  
Federal Home Loan Bank of San Francisco [Member] | Real Estate [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 529,200  
Federal Home Loan Bank of San Francisco [Member] | Equity Securities [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   29,400  
Federal Home Loan Bank of San Francisco [Member] | Other Assets [Member]      
Federal Home Loan Bank Stock   $ 7,400