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Note 8 - Borrowings (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2009
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2003
USD ($)
Dec. 22, 2016
USD ($)
Advances from Federal Home Loan Banks $ 123,000,000         $ 123,000,000 $ 123,000,000 $ 132,000,000      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 221,000,000         221,000,000 221,000,000        
Debt Issuance Costs, Net 541,000         541,000 541,000        
Amortization of Debt Issuance Costs             9,000 7,000 $ 6,000    
Interest Expense, Subordinated Notes and Debentures             334,000 294,000 $ 425,000    
Long-term Debt, Gross 160,017,000         160,017,000 160,017,000        
Purchase Property [Member]                      
Noncash or Part Noncash Acquisition, Fixed Assets Acquired   $ 2,000,000                  
Senior Notes [Member]                      
Debt Instrument, Face Amount                     $ 12,000,000
Debt Instrument, Interest Rate, Stated Percentage                     7.00%
Debt Issuance Costs, Net 372,000         $ 372,000 $ 372,000       $ 374,000
Interest Expense, Long-term Debt $ 25,000                    
Debt Instrument, Interest Rate, Effective Percentage 7.62%         7.62% 7.62%        
Amortization of Debt Issuance Costs $ 2,000                    
Long-term Debt, Gross 12,000,000         $ 12,000,000 $ 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         169,000 169,000 176,000      
Amortization of Debt Issuance Costs             7,000 7,000      
Interest Payable $ 6,000         $ 6,000 $ 6,000 430,000      
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 4.15%         4.15% 4.15%        
Number of Consecutive Quarters for Interest Deferment         20            
Interest Expense, Subordinated Notes and Debentures             $ 334,000 294,000      
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 1,769,000         1,769,000 1,769,000 1,900,000      
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         16,000,000 16,000,000        
Long-term Line of Credit $ 15,000,000         15,000,000 $ 15,000,000        
Line of Credit Facility, Required Compensating Balance, Amount           250,000          
Interest Expense, Debt           3,000          
Line of Credit Facility, Average Outstanding Amount           $ 11,000,000          
Line of Credit Facility, Interest Rate During Period           0.73%          
Minimum [Member]                      
Federal Home Loan Bank, Advances, Interest Rate 0.276%         0.276% 0.276%        
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate             3 days        
Maximum [Member]                      
Federal Home Loan Bank, Advances, Interest Rate 0.80%         0.80% 0.80%        
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate             4 years 36 days        
Federal Home Loan Bank Borrowings [Member]                      
Long Term Debt, Additional Available Amount $ 14,200,000         $ 14,200,000 $ 14,200,000        
Line of Credit Facility, Maximum Borrowing Capacity 2,000,000         2,000,000 2,000,000        
Long-term Line of Credit $ 0         $ 0 $ 0 $ 0