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Note 10 - Borrowings (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 29, 2018
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2009
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2003
USD ($)
Dec. 22, 2016
USD ($)
Long-term Debt, Total           $ 120,813,000 $ 130,900,000      
Advances from Federal Home Loan Banks, Total           90,000,000 100,000,000      
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total           $ 90,000,000        
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year           3.26%        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged           $ 267,500,000        
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds           78,400,000        
Debt Issuance Costs, Net, Total           429,000        
Amortization of Debt Issuance Costs           112,000 112,000 $ 97,000    
Subordinated Debt, Ending Balance           9,782,000 9,752,000      
Interest Expense, Subordinated Notes and Debentures           991,000 1,118,000 767,000    
Long-term Debt, Gross           121,242,000        
Federal Reserve Bank Advances [Member]                    
Loans Pledged as Collateral           40,900,000        
Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value, Total           26,300,000        
Short-term Debt, Total           0        
Correspondent Bank Agreement [Member] | Zions Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity           5,000,000 5,000,000      
Long-term Line of Credit, Total           0 0      
Interest Expense, Debt, Total           0 2,000 13,000    
Federal Home Loan Bank Advances [Member]                    
Long-term Debt, Total           90,000,000        
Debt Issuance Costs, Net, Total                  
Long-term Debt, Gross           90,000,000        
Senior Notes [Member]                    
Long-term Debt, Total           11,927,000        
Debt Instrument, Face Amount                   $ 12,000,000
Debt Instrument, Interest Rate, Stated Percentage                   7.00%
Debt Issuance Costs, Net, Total           73,000 147,000     $ 374,000
Interest Expense, Long-term Debt, Total           $ 915,000 915,000 915,000    
Debt Instrument, Interest Rate, Effective Percentage           7.60%        
Amortization of Debt Issuance Costs           $ 75,000 75,000 75,000    
Long-term Debt, Gross           12,000,000        
Senior Notes [Member] | Accrued Expenses and Other Liabilities [Member]                    
Interest Payable           23,000 23,000      
Subordinated Notes [Member]                    
Debt Instrument, Face Amount $ 10,000,000                  
Debt Instrument, Interest Rate, Stated Percentage 6.25%                  
Subordinated Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate 3.325%                  
Subordinated Debt [Member]                    
Long-term Debt, Total           9,782,000        
Interest Expense, Debt, Total           654,000 656,000 327,000    
Debt Issuance Costs, Net, Total $ 291,000         218,000 248,000      
Long-term Debt, Gross           10,000,000        
Junior Subordinated Debt [Member]                    
Long-term Debt, Total           8,110,000        
Interest Expense, Debt, Total     $ 1,700,000 $ 700,000            
Debt Issuance Costs, Net, Total           138,000 146,000 154,000    
Amortization of Debt Issuance Costs           8,000 8,000      
Interest Payable           $ 5,000 6,000      
Subordinated Debt, Ending Balance                 $ 8,000,000  
Payments of Debt Issuance Costs                 $ 240,000  
Excess Tier One Risk Based Capital to Risk Weighted Assets                 0.25  
Debt, Weighted Average Interest Rate           3.40%        
Number of Consecutive Quarters for Interest Deferment         20          
Interest Expense, Subordinated Notes and Debentures           $ 337,000 462,000      
Long-term Debt, Gross           $ 8,248,000        
Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate           3.15%        
Notes Payable, Other Payables [Member]                    
Long-term Debt, Total           $ 994,000        
Debt Instrument, Term (Year)   9 years                
Interest Expense, Debt, Total           19,000 23,000 26,000    
Debt Instrument, Face Amount   $ 2,000,000                
Debt Instrument, Interest Rate, Stated Percentage   1.75%                
Debt Issuance Costs, Net, Total                  
Long-term Debt, Gross           $ 994,000 1,200,000      
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid   $ 234,000                
Minimum [Member]                    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate           2.40%        
Minimum [Member] | Federal Home Loan Bank Advances [Member]                    
Debt Instrument, Term (Year)           2 years 182 days        
Maximum [Member]                    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate           4.23%        
Maximum [Member] | Federal Home Loan Bank Advances [Member]                    
Debt Instrument, Term (Year)           3 years 255 days        
Federal Home Loan Bank Borrowings [Member]                    
Long Term Debt, Additional Available Amount           $ 63,900,000        
Line of Credit Facility, Maximum Borrowing Capacity           2,000,000        
Long-term Line of Credit, Total           0 0      
Interest Expense, Debt, Total           $ 2,700,000 $ 2,200,000 $ 1,600,000