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Note 2 - Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2012
USD ($)
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 42,363,000 $ 34,265,000 $ 33,485,000 $ 40,425,000
Interest-bearing Deposits in Banks and Other Financial Institutions 32,800,000 23,000,000    
Cash Reserve Deposit Required and Made 9,900,000 7,500,000    
Goodwill, Impairment Loss 0      
Goodwill $ 16,127,000 16,127,000    
Number of Loan Portfolios 2      
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 $ 26,800,000      
Percentage of Collateral Dependent Impaired Loans Measured for Impairment by Utilizing Third Party Appraisals 76.10%      
Amount of Collateral Dependent Impaired Loans Measured For Impairment Using Internal Evaluations $ 8,400,000      
Percentage of Collateral Dependent Impaired Loans Measured for Impairment Using Internal Evaluations 23.90%      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group $ 0 0    
Advertising Expense $ 2,100,000 $ 1,800,000 $ 1,900,000  
Employee Stock Option [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | shares     151,900  
Antidilutive Options Excluded from Computation of Earnings Per Share [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares     $ 18.55  
Employee Stock Option [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | shares 0 0    
Minimum [Member] | Bank Premises and Equipment [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 3 years      
Maximum [Member] | Bank Premises and Equipment [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 40 years