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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value $ 51,546 $ 35,857 $ 42,363 $ 34,265
Interest-bearing Deposits in Banks and Other Financial Institutions 39,400 25,800    
Cash Reserve Deposit Required and Made 9,700 10,100    
Goodwill, Impairment Loss 0 0 0  
Goodwill $ 16,127 $ 16,127    
Allowance for Loan and Lease Losses, Loss Emergence Period 1 year 120 days 1 year    
Allowance for Loan and Lease Losses, Adjustments, Change in Loss Emergence Period $ 500      
Fair Value, Collateral Dependent Loans, Percentage of Appraised or Internally Estimated Value of Property 85.00%      
Amount of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals $ 28,000      
Percentage of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals 72.80%      
Amount of Collateral-Dependent Impaired Loans Measured for Impairment Using Internal Evaluations $ 10,400      
Percentage of Collateral-dependent Impaired Loans Measured for Impairment Using Internal Evaluations 27.20%      
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group 0 $ 0    
Other Real Estate 0 533 4,932 $ 6,326
Advertising Expense $ 2,400 $ 2,400 $ 2,100  
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0  
Bank Premises and Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 3 years      
Bank Premises and Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 17 years