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Note 6 - Term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2019
Dec. 31, 2018
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   2.00%  
Federal Funds Purchased [Member] | Maximum [Member]      
Debt Instrument, Interest Rate, Stated Percentage   2.86%  
Federal Reserve Bank Advances [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 24,900  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   0 0
Senior Notes [Member]      
Debt Instrument, Periodic Payment, Total 83    
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid 5,000    
Debt Issuance Costs, Gross $ 15    
Senior Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 4.00%    
Subordinated Debt [Member] | Fixed to Floating Interest Rate [Member]      
Debt Issuance Costs, Gross $ 210    
Debt Instrument, Interest Rate, Stated Percentage 6.88%    
Debt Fixed Interest Term 5 years    
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fixed to Floating Interest Rate [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   32,600  
Federal Home Loan Bank of San Francisco [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   436,500  
Advances from Federal Home Loan Banks, Total   0 0
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding   12,900 22,500
Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End   40,000 $ 70,000
Federal Home Loan Bank of San Francisco [Member] | Real Estate [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   494,900  
Federal Home Loan Bank of San Francisco [Member] | Equity Securities [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   26,500  
Federal Home Loan Bank of San Francisco [Member] | Other Assets [Member]      
Federal Home Loan Bank Stock   $ 7,400