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Note 8 - Borrowings (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2009
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2003
USD ($)
Dec. 22, 2016
USD ($)
Advances from Federal Home Loan Banks         $ 123,000,000 $ 120,000,000 $ 123,000,000      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged           269,700,000        
Debt Issuance Costs, Net           459,000        
Amortization of Debt Issuance Costs           82,000 9,000 $ 7,000    
Interest Expense, Subordinated Notes and Debentures           360,000 334,000 $ 294,000    
Long-term Debt, Gross           141,828,000        
Senior Notes [Member]                    
Debt Instrument, Face Amount                   $ 12,000,000
Debt Instrument, Interest Rate, Stated Percentage                   7.00%
Debt Issuance Costs, Net         $ 372,000 297,000 372,000     $ 374,000
Interest Expense, Long-term Debt           915,000 $ 25,000      
Debt Instrument, Interest Rate, Effective Percentage         7.62%   7.62%      
Amortization of Debt Issuance Costs           75,000 $ 2,000      
Long-term Debt, Gross           12,000,000        
Senior Notes [Member] | Accrued Expenses and Other Liabilities [Member]                    
Interest Payable         $ 23,000 23,000 23,000      
Junior Subordinated Debt [Member]                    
Interest Expense, Debt   $ 1,700,000 $ 700,000              
Debt Issuance Costs, Net         169,000 162,000 169,000      
Amortization of Debt Issuance Costs           7,000 7,000      
Interest Payable         6,000 $ 6,000 6,000      
Subordinated Debt                 $ 8,000,000  
Payments of Debt Issuance Costs                 $ 240,000  
Excess Tier One Risk Based Capital to Risk Weighted Assets                 25.00%  
Derivative, Variable Interest Rate           4.82%        
Number of Consecutive Quarters for Interest Deferment       20            
Interest Expense, Subordinated Notes and Debentures           $ 360,000 334,000      
Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate           3.15%        
Notes Payable, Other Payables [Member]                    
Debt Instrument, Face Amount $ 2,000,000                  
Debt Instrument, Interest Rate, Stated Percentage 1.75%                  
Debt Issuance Costs, Net                  
Debt Instrument, Term 9 years                  
Long-term Debt, Gross         1,800,000 1,580,000 1,800,000      
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid $ 234,000                  
Correspondent Bank Agreement [Member] | Zions Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity           16,000,000        
Long-term Line of Credit         15,000,000 0 15,000,000      
Line of Credit Facility, Required Compensating Balance, Amount           250,000        
Interest Expense, Debt         3,000 $ 2,016        
Minimum [Member]                    
Federal Home Loan Bank, Advances, Interest Rate           0.33%        
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate           169 days        
Maximum [Member]                    
Federal Home Loan Bank, Advances, Interest Rate           1.40%        
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate           4 years 211 days        
Federal Home Loan Bank Borrowings [Member]                    
Long Term Debt, Additional Available Amount           $ 46,100,000        
Line of Credit Facility, Maximum Borrowing Capacity           2,000,000        
Long-term Line of Credit         $ 0 $ 0 $ 0