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Note 16 - Stock Based Compensation - (Details Textual)
1 Months Ended 12 Months Ended 18 Months Ended
Dec. 20, 2016
USD ($)
shares
Feb. 01, 2016
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
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      
Allocated Share-based Compensation Expense, Total | $     $ 63,000 $ 766,000        
Stock Issued During Period, Shares, Issued for Services       3,750 4,410      
Stock Issued During Period, Shares, Share-based Compensation, Gross       5,552 1,000      
Noninterest Expense Directors Fees | $       $ 436,000 $ 400,000 $ 337,000    
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, Options, Grants in Period, Gross       0 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number       761,747     761,747  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares       $ 12.64     $ 12.64  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance       18,333     18,333  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $       $ 81,000     $ 81,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years        
Share-based Compensation Arrangement by Share-based Payment Award Options, Amended, Number of Shares 330,000   105,250          
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  
Warrant [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Total | $   $ 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 $ 75,000      
Employee [Member]                
Allocated Share-based Compensation Expense, Total | $       $ 140,000 $ 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 3      
Allocated Share-based Compensation Expense, Total | $         $ 129,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $     $ 92,000 $ 1,100,000 92,000   $ 1,100,000  
Employee Stock Option [Member]                
Allocated Share-based Compensation Expense, Total | $ $ 168,000     $ 119,000 $ 207,000      
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