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Note 15 - Stock Based Compensation - (Details Textual)
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 20, 2016
USD ($)
shares
Feb. 01, 2016
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Jun. 29, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     1,500,000 1,500,000 1,500,000      
Stock Issued During Period, Shares, Issued for Services         4,410      
Stock Issued During Period, Shares, Share-based Compensation, Gross         1,000      
Noninterest Expense Directors Fees | $         $ 400,000 $ 337,000 $ 325,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 10 $ 10 $ 10 $ 10 $ 10    
Class of Warrant or Right, Outstanding     87,625 87,625 87,625 87,625    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate           1.18%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term           5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate           1.36%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate           31.68%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         0 50,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares         $ 17.65    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number     784,698 784,698 784,698      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares     $ 12.49 $ 12.49 $ 12.49      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares     46,382 46,382 46,382      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $     $ 210,000 $ 210,000 $ 210,000      
Share-based Compensation Arrangement by Share-based Payment Award Options, Amended, Number of Shares 330,000   105,250          
Class of Warrant or Right, Date from which Warrants or Rights Exercisable         Feb. 01, 2011      
Warrant Expiration Date   Feb. 02, 2019            
Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term         10 years      
Common Stock [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     101,000 101,000 101,000      
Warrant [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost | $   $ 48,000            
Share-based Compensation Arrangement by Share-based Payment Award Warrants Assumed Weighted Average Grant Date Fair Value | $ / shares         $ 2.50      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate         1.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term         6 years 182 days      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate         5.04%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate         13.19%      
Non-employee Directors [Member]                
Noninterest Expense Directors Fees | $         $ 75,000      
Employee [Member]                
Allocated Share-based Compensation Expense | $         $ 17,000      
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Vesting, Number of Equal Installments         3      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         2 years      
Allocated Share-based Compensation Expense | $         $ 129,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $     $ 92,000 $ 92,000 92,000      
Employee Stock Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years    
Allocated Share-based Compensation Expense | $ $ 168,000   $ 63,000   $ 207,000 $ 240,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         3 years      
The 2017 Equity Incentive Plan [Member]                
Common Stock, Capital Shares Reserved for Future Issuance               500,000
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Gross       0        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     500,000 500,000 500,000