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Note 14 - Stock Compensation Plans (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2018
May 31, 2013
May 31, 2008
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2007
Dec. 31, 2017
Employee Stock Ownership Plan (ESOP), Compensation Expense       $ 186,000 $ 192,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.75            
Restricted Stock [Member]              
Share-based Payment Arrangement, Expense       129,000 107,000    
Share-based Payment Arrangement, Expense, Tax Benefit       27,000 22,000    
Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense, Tax Benefit       $ 2,000 1,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       3 years 146 days      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 994,000 330,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       836,000 533,000    
Share-based Payment Arrangement, Expense, after Tax       44,000 $ 41,000    
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount       $ 149,000      
Share-based Payment Arrangement, Option [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years      
The 2008 Recognition and Retention Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award     111,090        
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased     $ 4.68        
Share-based Payment Arrangement, Cash Used to Settle Award     $ 520,000        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   195,000   0      
The 2013 Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   195,000          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years      
The 2013 Stock Incentive Plan [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   48,750          
Percentage of Shares May Be Granted As Restricted Stock Awards   25.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       0      
The 2013 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   146,250          
The 2018 Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 155,000            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years      
The 2018 Stock Incentive Plan [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 38,750            
Percentage of Shares May Be Granted As Restricted Stock Awards 25.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       11,750      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount       $ 437,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       3 years 146 days      
The 2018 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 116,250            
Stock Incentive Plan [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance       38,887      
The 2008 Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     277,726        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       0      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price     $ 5        
The Option Plan and Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       37,250      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price       $ 8.10 $ 5    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       256,336 279,836   265,302
Employee Stock Ownership Plan [Member]              
Percentage of Company Shares Purchased by ESOP           8.00%  
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP           222,180  
ESOP Loan Interest Rate           7.75%  
Employee Stock Ownership Plan (ESOP), Loan Term           15 years