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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2009
Dec. 31, 2015
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 118,561 $ 51,546 $ 35,857   $ 42,363
Interest-bearing Deposits in Banks and Other Financial Institutions 105,800 39,400      
Cash Reserve Deposit Required and Made 4,400 9,700      
Interest Income, Securities, Operating, Tax Exempt 3,400 3,700 3,100    
Goodwill, Impairment Loss 0 0 0    
Goodwill, Ending Balance 16,127 16,127      
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total $ 600     $ (200)  
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 $ 17,000        
Percentage of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals 83.00%        
Amount of Collateral-Dependent Impaired Loans Measured for Impairment Using Internal Evaluations $ 3,500        
Percentage of Collateral-dependent Impaired Loans Measured for Impairment Using Internal Evaluations 17.00%        
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance 0 0      
Other Real Estate, Ending Balance 0 0 533   $ 4,932
Other than Temporary Impairment Losses, Investments, Total 0        
Advertising Expense $ 2,200 $ 2,400 $ 2,400    
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 10 years        
Originated Before January 1, 2010 [Member]          
Percent of Loan Portfolio to Total Loans       11.00%