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Note 9 - 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, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2003
USD ($)
Dec. 22, 2016
USD ($)
Long-term Debt, Total           $ 130,983,000 $ 141,400,000      
Advances from Federal Home Loan Banks, Total           100,000,000 120,000,000      
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total           40,000,000        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged           258,600,000        
Debt Issuance Costs, Net, Total           653,000        
Amortization of Debt Issuance Costs           97,000 82,000 $ 9,000    
Subordinated Debt, Ending Balance           9,723,000      
Interest Expense, Subordinated Notes and Debentures           767,000 360,000 $ 334,000    
Long-term Debt, Gross           131,636,000        
Senior Notes [Member]                    
Long-term Debt, Total           11,778,000        
Debt Instrument, Face Amount                   $ 12,000,000
Debt Instrument, Interest Rate, Stated Percentage                   7.00%
Debt Issuance Costs, Net, Total           222,000 297,000     $ 374,000
Interest Expense, Long-term Debt, Total           $ 915,000 $ 915,000      
Debt Instrument, Interest Rate, Effective Percentage           7.62% 7.62%      
Amortization of Debt Issuance Costs           $ 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 Debt [Member]                    
Long-term Debt, Total           9,723,000        
Interest Expense, Debt, Total           327,000        
Debt Issuance Costs, Net, Total $ 291,000         277,000        
Long-term Debt, Gross           10,000,000        
Junior Subordinated Debt [Member]                    
Long-term Debt, Total           8,094,000        
Interest Expense, Debt, Total     $ 1,700,000 $ 700,000            
Debt Issuance Costs, Net, Total           $ 154,000 162,000      
Debt Instrument, Interest Rate, Effective Percentage           5.97%        
Amortization of Debt Issuance Costs           $ 7,000 7,000      
Interest Payable           8,000 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                 25.00%  
Number of Consecutive Quarters for Interest Deferment         20          
Interest Expense, Subordinated Notes and Debentures           440,000 360,000      
Long-term Debt, Gross           8,248,000        
Notes Payable, Other Payables [Member]                    
Long-term Debt, Total           1,388,000        
Interest Expense, Debt, Total           26,000 29,000      
Debt Instrument, Face Amount   $ 2,000,000                
Debt Instrument, Interest Rate, Stated Percentage   1.75%                
Debt Issuance Costs, Net, Total                  
Debt Instrument, Term   9 years                
Long-term Debt, Gross           $ 1,388,000 1,600,000      
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid   $ 234,000                
London Interbank Offered Rate (LIBOR) [Member] | Subordinated Notes [Member]                    
Debt Instrument, Basis Spread on Variable Rate 3.325%                  
London Interbank Offered Rate (LIBOR) [Member] | Junior Subordinated Debt [Member]                    
Debt Instrument, Basis Spread on Variable Rate           3.15%        
Advances from FHLB, Callable in Second Half of 2018 and Up to October 2020 [Member]                    
Advances from Federal Home Loan Banks, Total           $ 60,000,000        
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate at Period End           1.00%        
Correspondent Bank Agreement [Member] | Zions Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity           $ 26,000,000 16,000,000      
Long-term Line of Credit, Total           0 0      
Interest Expense, Debt, Total           $ 13,000 2,000      
Minimum [Member]                    
Federal Home Loan Bank, Advances, Interest Rate           2.68%        
Minimum [Member] | Advances from FHLB, Callable in Second Half of 2018 and Up to October 2020 [Member]                    
Federal Home Loan Bank, Advances, Fixed Interest Rate, after One Year           3.47%        
Minimum [Member] | Advances from FHLB, Callable in Second Half of 2018 and Up to October 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Federal Home Loan Bank, Advances, Basis Spread on Floating Rate of Amounts Due After 90 Days           1.00%        
Maximum [Member]                    
Federal Home Loan Bank, Advances, Interest Rate           3.20%        
Maximum [Member] | Advances from FHLB, Callable in Second Half of 2018 and Up to October 2020 [Member]                    
Federal Home Loan Bank, Advances, Fixed Interest Rate, after One Year           4.23%        
Maximum [Member] | Advances from FHLB, Callable in Second Half of 2018 and Up to October 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Federal Home Loan Bank, Advances, Basis Spread on Floating Rate of Amounts Due After 90 Days           2.00%        
Federal Home Loan Bank Borrowings [Member]                    
Long Term Debt, Additional Available Amount           $ 47,900,000        
Line of Credit Facility, Maximum Borrowing Capacity           2,000,000 2,000,000      
Long-term Line of Credit, Total           0 0      
Interest Expense, Debt, Total           $ 1,600,000 $ 702,000