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Note 10 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Other real estate owned $ 638 $ 533
Fair Value, Measurements, Nonrecurring [Member]        
Impaired loans 14,892 16,027    
Other real estate owned 638    
Other Repossessed Assets 106    
Total assets 15,636 16,027    
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Impaired loans    
Other real estate owned    
Other Repossessed Assets    
Total assets    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Impaired loans    
Other real estate owned    
Other Repossessed Assets    
Total assets    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Impaired loans 14,892 16,027    
Other real estate owned 638    
Other Repossessed Assets 106    
Total assets $ 15,636 $ 16,027